Div cannot scroll up and down, scroll bar is hidden

as shown in the figure, the red part div scrolls up and down normally, while the blue part cannot scroll.
both use the method that the width of the content div is larger than the width of the parent div, and the two are nested to hide the scroll bar.

clipboard.png 

<!DOCTYPE HTML>
<html>
<head>
<style type="text/css">
html,body{
    font:14px "Nova",sans-serif;
    height:100%;
}
ul li{
    list-style:none;
}
u{
    text-decoration:none;
}
*{
    margin:0px;
    padding:0px;
}
.left{
    position:absolute;
    left:0px;
    top:0px;
    height:100%;
    width:100px;
    overflow:hidden;
}
.left-main{
    height:100%;
    width:119px;
    background-color:-sharp1d2530;
    overflow-y:scroll;
    overflow-x:hidden;
}
.left-top{
    position:fixed;
    top:0px;
    left:0px;
}
.left-top li{
    width:60px;
    height:60px;
    margin:20px;
}
.left-bottom{
    position:absolute;
    bottom:0px;
    left:14px;
}
.left-bottom li{
    width:16px;
    height:16px;
    margin:10px;
}
.left-bottom li:first-of-type{
    float:left;
}
.left-bottom li:last-of-type{
    float:right;
}
.menu{
    position:absolute;
    width:250px;
    top:0px;
    left:100px;
    height:100%;
    overflow:hidden;
}
.menu-main{
    height:100%;
    width:268px;
    overflow-y:scroll;
    overflow-x:hidden;
    background-color:-sharp212c3b;
}
.MENU{
    margin-top:30px;
    padding-right:30px;
}
.MENU li{
    height:24px;
    margin-bottom:12px;
    line-height:24px;
}
.MENU li span:first-of-type{
    float:left;
    margin-left:30px;
}
.MENU li:last-of-type{
    margin-bottom:24px;
}
.menuicon1{
    float:right;
}
.radius{
    float:right;
    height:24px;
    width:30px;
    text-align:center;
    color:white;
    border-radius:8px 8px;
    background-color:-sharp3399ff;
}
.PRODUCTS{
    margin-top:24px;
    padding-right:30px;
}
.PRODUCTS li{
    height:24px;
    margin-bottom:12px;
    line-height:24px;
}
.PRODUCTS li u{
    width:24px;
    height:24px;
    margin-left:30px;
}

.PRODUCTS li span{
    margin-left:2px;
}
.PRODUCTS .YOUR-PRODUCTS{
    margin-left:30px;
}
.menuicon2{
    float:right;
}
.PRODUCTS li:last-of-type{
    margin-bottom:24px;
}
.line1{
    width:200px;
    height:1px;
    margin:0 auto;
    background-color:-sharp2A3546;
}
.line2{
    width:200px;
    height:1px;
    margin:0 auto;
    background-color:-sharp2A3546;
}
.DASHBOARD {
    margin-top:30px;
    padding-right:30px;
}
.DASHBOARD  li{
    height:24px;
    margin-bottom:12px;
    line-height:24px;
}
.DASHBOARD  li span:first-of-type{
    float:left;
    margin-left:30px;
}
.DASHBOARD  li:last-of-type{
    margin-bottom:24px;
}
.menuicon3{
    float:right;
}
.menubottom{
    margin-top:20px;
    padding-right:30px;
}
.menubottom li{
    height:24px;
        line-height:24px;
}
.menubottom .Money{
    float:right;
}
.menubottom .Monthly{
    margin-left:30px;
    float:left;
}
.leftmessage{
    width:400px;
    height:100%;
    left:350px;
    top:0px;
    position:absolute;
}
.leftmessage-top{
    height:80px;
    line-height:80px;
    width:100%;
    position:absolute;
    top:0px;
    font-size:24px;
    z-index:100;
    background-color:white;
}
.leftmessage-top span{
    margin-left:20px;
}
.leftmessage-search{
    position:absolute;
    top:80px;
    left:0px;
    height:79px;
    width:100%;
    border-top:1px solid gray;
    border-right:1px solid gray;
    z-index:100;
    background-color:white;
}
.leftmessage-search input{
    width:350px;
    height:30px;
    margin-top:20px;
    border-radius:5px 5px 5px 5px;
    background-image:url(./images/search.png);
    background-repeat:no-repeat;
    background-position:330px 7.5px;
    margin-left:20px;
    }
.leftmessage-bottom-main{
    width:400px;
    height:100%;
    position:absolute;
    top:0px;
    overflow:hidden;
    border-left:0px;
    z-index:10;
}
.leftmessage-bottom{
    overflow-y:scroll;
    overflow-x:hidden;
    width:420px;
    height:100%;
}
.leftmessage-bottom1{
    width:350px;
    height:130px;
    margin-top:160px;
    padding-left:25px;
    padding-right:25px;
    border:1px solid gray;
    border-left:2px solid -sharp3399ff;    
}
.leftmessage-bottom2{
    width:350px;
    height:130px;
    margin-top:0px;
    padding-left:25px;
    padding-right:25px;
    border-bottom:1px solid gray;
}
.leftmessage-bottom1-top{
    height:46px;
    line-height:46px;
    margin-top:10px;
    margin-bottom:10px;
}
.leftmessage-bottom1-top img{
    width:46px;
    height:46px;
}
.leftmessage-bottom1-top ul{
    float:right;
    display:inline-block;
    width:250px;
    margin-right:25px;
    line-height:20px;    
}
.leftmessage-bottom1-top ul span{
    margin-top:-30px;
    float:right;
}
.leftmessage-bottom1-bottom p{
    width:270px;
    height:60px;
}
.leftmessage-bottom1-bottom{
    width:350px;
}
.leftmessage-bottom1-bottom .noread{
    float:right;
    width:20px;
    height:20px;
    color:white;
    background-color:-sharp3399ff;
    margin-top:-40px;
    margin-right:20px;
    text-align:center;
    border-radius:90px 90px 90px 90px;
}
.rightmessage{
    height:100%;
    width:100%;
    position:absolute;
    z-index:-5;
}
.rightmessage-top-txt{
    margin-top:20px;
    height:40px;
    float:right;
    padding-left:20px;
    padding-right:60px;
}
.rightmessage-top-image{
    margin-top:20px;
    float:right;
}
.rightmessage-top{
    border:1px solid white;
    border-bottom:1px solid gray;    
    height:79px;
    position:absolute;
    top:0px;
    right:0px;
    width:100%;
    z-index:-5;
    background-color:white;
}
.rightmessage-bottom-history{
    width:100%;
    height:100%;
}
.rightmessage-bottom-history-bar{
    height:80px;
    padding-left:750px;
    margin-top:80px;
    padding-right:0px;
    border-bottom:2px solid gray;
    z-index:-5;
}
.right-user{
    width:300px;
    float:left;
}

.rightmessage-bottom-history-bar span{
    line-height:80px;
    margin-left:30px;
}
.right-user-icon1{
    width:120px;
    position:absolute;
    top:100px;
    right:200px;
    border-right:1px solid gray
}
.right-user-icon1 img{
    width:25px;
    height:25px;
    border-radius:8px 8px 8px 8px;
}
.right-user-icon2{
    position:absolute;
    top:100px;
    right:20px;
}
.right-user-icon2 img{
    width:25px;
    height:25px;
    border-radius:8px 8px 8px 8px;
}
.right-user-onetwoeight span{
    display:inline-block;
    position:absolute;
    right:120px;
    top:80px;
}
.rightmessage-bottom-history{
    width:100%;
    height:100%;
    position:absolute;
    overflow:hidden;
}
.rightmessage-bottom-history-txt{
    padding-left:750px;
    height:100%;
    width:115%;
    overflow-x:hidden;
    overflow-y:scroll;
    
}
.rightmessage-bottom-history-txt1{
    margin-top:159px;
    padding-left:20px;
    padding-top:20px;
    border-left:1px solid gray;
    border-bottom:1px solid gray;
}
.rightmessage-bottom-history-txt1 ul{
    width:600px;
    margin-left:60px;
    margin-top:-50px;
    line-height:30px;
    margin-bottom:20px;
}
.rightmessage-bottom-history-txt2{
    padding-left:20px;
    padding-top:20px;
    border-left:1px solid gray;
    border-bottom:1px solid gray;
}
.rightmessage-bottom-history-txt2 ul{
    width:600px;
    margin-left:60px;
    margin-top:-50px;
    line-height:30px;
    margin-bottom:20px;
}
.twoimages{
    margin-left:50px;
    margin-bottom:10px;
}
.lasttext{
    position:fixed;
    margin-bottom:20px;
    bottom:20px;
    left:770px;
}
.plus{
    width: 55px;
    height: 56px;
    border-right: solid 1px -sharpdfe3e9;
    background-color:white; 
}
.plustext{
    margin-left:-4px;
    border: solid 1px -sharpdfe3e9;
    height:55px;
    width:600px;
}
.leftname1{
    color:-sharp3399ff;
}
.leftday{
    color:gray;
}
.rightmessage-bottom-history-maintxt{
    width:100%;
    height:100%;
    position:absolute;
    top:0px;
    overflow:hidden;
}
</style>
</head>
<body>
<div class="left">
<div class="left-main">
<div class="left-top">
<ul>
<li><img src="C:\Users\Black\Desktop\day12\images\icon1.png"></li>
<li><img src="C:\Users\Black\Desktop\day12\images\icon2.png"></li>
<li><img src="C:\Users\Black\Desktop\day12\images\icon3.png"></li>
<li><img src="C:\Users\Black\Desktop\day12\images\icon4.png"></li>
</ul>
</div>
<div class="left-bottom">
<ul>
<li><img src="C:\Users\Black\Desktop\day12\images\sicon3.png"></li>
<li><img src="C:\Users\Black\Desktop\day12\images\sicon4.png"></li>
<ul>
</div>
</div>
</div>
<div class="menu">
<div class="menu-main">
<ul class="MENU">
<li>
<span>MENU</span>
<img class="menuicon1" src="C:\Users\Black\Desktop\day12\images\sicon3.png"></li>
</li>
<li>
<span>Overview</span> 
</li>
<li>
<span>Sales</span> 
<a class="radius">54</a>
</li>
<li>
<span>Your Staff</span> 
</li>
<li>
<span>Analytics & Targeting</span> 
</li>
<li>
<span>What" s New </span> 
</li>
</ul>
<p class="line1">

<ul class="PRODUCTS">
<li>
<span class="YOUR-PRODUCTS">YOUR PRODUCTS</span>
<img class="menuicon2" src="C:\Users\Black\Desktop\day12\images\sicon3.png"></li>
</li>
<li>
<u><img src="C:\Users\Black\Desktop\day12\images\video.png"></u>
<span>Books</span>
</li>
<li>
<u><img src="C:\Users\Black\Desktop\day12\images\video.png"></u>
<span>Tutorials</span> 
</li>
<li>
<u><img src="C:\Users\Black\Desktop\day12\images\video.png"></u>
<span>Stocks</span> 
</li>
<li>
<u><img src="C:\Users\Black\Desktop\day12\images\video.png"></u>
<span>Infographics</span> 
</li>
</ul>
<p class="line2">

<ul class="DASHBOARD">
<li>
<span>DASHBOARD</span>
<img class="menuicon3" src="C:\Users\Black\Desktop\day12\images\sicon3.png"></li>
</li>
<li>
<span>Messages</span> 
</li>
<li>
<span>Connections</span> 
<a class="radius">54</a>
</li>
<li>
<span>Integrations</span> 
</li>
<li>
<span>Account Settings</span> 
</li>
</ul>
<ul class="menubottom">
<li>
<span class="Monthly">Monthly Goals</span>
<span class="Money">$580/$3200</span>
</li>
</ul>
</div>
</div>
<div class="leftmessage">
<div class="leftmessage-top">
<span>Messages</span>
</div>
<div class="leftmessage-search">
<input type="text" value="search">
</div>
<div class="leftmessage-bottom-main">
<div class="leftmessage-bottom">
<div class="leftmessage-bottom1">
<div class="leftmessage-bottom1-top">
<img src="C:\Users\Black\Desktop\day12\images\person1.png"> 
<ul>
<li>
<a class="circle"></a>
<u class="leftname1">Bessie Berry</u>
</li>
<li>
<u class="leftday">Twitter</u>
</li>
<span>3M<span>
</ul>
</div>
<div class="leftmessage-bottom1-bottom">

I pay for the 4Mb/sec down, 512 Kb/sec up service from O2. In fact, it"s relatively quick, and stable... 

<u class="noread">4</u>
</div>
</div>
<div class="leftmessage-bottom2">
<div class="leftmessage-bottom1-top">
<img src="C:\Users\Black\Desktop\day12\images\person7.png"> 
<ul>
<li>
<a class="circle"></a>
<u class="leftname">Victor Weber </u>
</li>
<li>
<u class="leftday">Adobe</u>
</li>
<span>8M<span>
</ul>
</div>
<div class="leftmessage-bottom1-bottom">

I shared this on my fb wall a few months back, and I thought I"d share it here again because it"s such a great... 

<u class="nnoread"></u>
</div>
</div>
<div class="leftmessage-bottom2">
<div class="leftmessage-bottom1-top">
<img src="C:\Users\Black\Desktop\day12\images\person2.png"> 
<ul>
<li>
<a class="circle"></a>
<u class="leftname">Dustin Benson</u>
</li>
<li>
<u class="leftday">Facebook</u>
</li>
<span>Yesterday<span>
</ul>
</div>
<div class="leftmessage-bottom1-bottom">

If there is anyone who needs an invitation please add yourself in the comments of this post!  

<u class="nnoread"></u>
</div>
</div>
<div class="leftmessage-bottom2">
<div class="leftmessage-bottom1-top">
<img src="C:\Users\Black\Desktop\day12\images\person3.png"> 
<ul>
<li>
<a class="circle"></a>
<u class="leftname">Jack Mason</u>
</li>
<li>
<u class="leftday">Yahoo</u>
</li>
<span>Yesterday<span>
</ul>
</div>
<div class="leftmessage-bottom1-bottom">

BruteDC is a peer-to-peer movie+tv series sharing and downloading platform which works on intranet inside...  

<u class="nnoread"></u>
</div>
</div>
<div class="leftmessage-bottom2">
<div class="leftmessage-bottom1-top">
<img src="C:\Users\Black\Desktop\day12\images\person4.png"> 
<ul>
<li>
<a class="circle"></a>
<u class="leftname">Stephen Shelton </u>
</li>
<li>
<u class="leftday">Snapchat</u>
</li>
<span>Stephen Shelton <span>
</ul>
</div>
<div class="leftmessage-bottom1-bottom">

Yes, p2p traffic is often filtered (QoSed). Although i do use BT on O2 wires, and in good days dl speed...  

<u class="nnoread"></u>
</div>
</div>
<div class="leftmessage-bottom2">
<div class="leftmessage-bottom1-top">
<img src="C:\Users\Black\Desktop\day12\images\person5.png"> 
<ul>
<li>
<a class="circle"></a>
<u class="leftname">Sally Willis </u>
</li>
<li>
<u class="leftday">Twitter</u>
</li>
<span>12 Jun<span>
</ul>
</div>
<div class="leftmessage-bottom1-bottom">

Yes, it"s O2: "internet extreme", which is no longer offered.  

<u class="nnoread"></u>
</div>
</div>
<div class="leftmessage-bottom2">
<div class="leftmessage-bottom1-top">
<img src="C:\Users\Black\Desktop\day12\images\person6.png"> 
<ul>
<li>
<a class="circle"></a>
<u class="leftname">Robert Patton </u>
</li>
<li>
<u class="leftday">A Team</u>
</li>
<span>9 Jun<span>
</ul>
</div>
<div class="leftmessage-bottom1-bottom">

I change my service from this 4Mb plan to their much 

<u class="n    noread"></u>
</div>
</div>
</div>
</div>
</div>
<div class="rightmessage">
<div class="rightmessage-top">
<div class="rightmessage-top-txt"> 
<ul>
<li>
Jordan J.
</li>
<li>
Administrator
</li>
</ul>
</div>
<div class="rightmessage-top-image">
<img src="C:\Users\Black\Desktop\day12\images\person1.png">
</div>
</div>
<div class="rightmessage-bottom-history">
<div class="rightmessage-bottom-history-bar">
<div class="right-user">
<span>Bessie Berry</span>
<u class="circlegreen"></u>
</div>
<div class="right-user-right">
<div class="right-user-icon1">
<img src="C:\Users\Black\Desktop\day12\images\1.png">
<img src="C:\Users\Black\Desktop\day12\images\2.png">
<img src="C:\Users\Black\Desktop\day12\images\3.png">
</div>
<div class="right-user-onetwoeight">
<span>1 of 28</span>
</div>
<div class="right-user-icon2">
<img src="C:\Users\Black\Desktop\day12\images\2.png">
<img src="C:\Users\Black\Desktop\day12\images\3.png">
</div>
</div>
</div>

</div>
<div class="rightmessage-bottom-history-maintxt">
<div class="rightmessage-bottom-history-txt">
<div class="rightmessage-bottom-history-txt1">
<div class="rightmessage-bottom-history1-user">
<div class="rightmessage-bottom-history1-user-img">
<img src="C:\Users\Black\Desktop\day12\images\person1.png">
</div>
<ul>
<li>Bessie Berry 8:31 AM </li>
<li>Hi guys Ive got the O2 package and have really slow internet. A speed check online said i can get 3mbps but
 it seems more like 0.5 these days, just freezing and taking ages to open pages and open audio files for example.
 I have decided to switch to the UPC package which offers 10mbps but do you think i will get it?</li>
</ul>
</div>
</div>
<div class="rightmessage-bottom-history-txt2">
<div class="rightmessage-bottom-history1-user">
<div class="rightmessage-bottom-history1-user-img">
<img src="C:\Users\Black\Desktop\day12\images\person1.png">
</div>
<ul>
<li>Bessie Berry 8:31 AM </li>
<li>Hi guys Ive got the O2 package and have really slow internet. A speed check online said i can get 3mbps but
 it seems more like 0.5 these days, just freezing and taking ages to open pages and open audio files for example.
 I have decided to switch to the UPC package which offers 10mbps but do you think i will get it?</li>
</ul>
</div>
</div>
<div class="rightmessage-bottom-history-txt2">
<div class="rightmessage-bottom-history1-user">
<div class="rightmessage-bottom-history1-user-img">
<img src="C:\Users\Black\Desktop\day12\images\person1.png">
</div>
<ul>
<li>Bessie Berry 8:31 AM </li>
<li>Hi guys Ive got the O2 package and have really slow internet. A speed check online said i can get 3mbps but
 it seems more like 0.5 these days, just freezing and taking ages to open pages and open audio files for example.
 I have decided to switch to the UPC package which offers 10mbps but do you think i will get it?</li>
</ul>
</div>
<div class="twoimages">
<img src="C:\Users\Black\Desktop\day12\images\photo1.png">
<img src="C:\Users\Black\Desktop\day12\images\photo2.png">
</div>
</div>
<div class="rightmessage-bottom-history-txt2">
<div class="rightmessage-bottom-history1-user">
<div class="rightmessage-bottom-history1-user-img">
<img src="C:\Users\Black\Desktop\day12\images\person1.png">
</div>
<ul>
<li>Bessie Berry 8:31 AM </li>
<li>Hi guys Ive got the O2 package and have really slow internet. A speed check online said i can get 3mbps but
 it seems more like 0.5 these days, just freezing and taking ages to open pages and open audio files for example.
 I have decided to switch to the UPC package which offers 10mbps but do you think i will get it?</li>
</ul>
</div>
</div>
<div class="rightmessage-bottom-history-txt2">
<div class="rightmessage-bottom-history1-user">
<div class="rightmessage-bottom-history1-user-img">
<img src="C:\Users\Black\Desktop\day12\images\person1.png">
</div>
<ul>
<li>Bessie Berry 8:31 AM </li>
<li>Hi guys Ive got the O2 package and have really slow internet. A speed check online said i can get 3mbps but
 it seems more like 0.5 these days, just freezing and taking ages to open pages and open audio files for example.
 I have decided to switch to the UPC package which offers 10mbps but do you think i will get it?</li>
</ul>
<div class="lasttext">
<button class="plus" value="+"><i>+</i></button>
<input type="text" class="plustext" value="Well, kinda both :) but more of that second option, i`ve seen many systems infected and crawling with">
</div>
</div>
</div>
</div>
</div>
</body>
</html>
Css html
Mar.10,2021

is overflow:hidden added to the right

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e4768e-44c0d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4768e-44c0d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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