There is a spacing problem with html layout.

html 

   


 and .tool-container if there is no width:100%;, the default is not full, why? 
 I hope I can simply build a html to paste my code into it and help me find the problem. Thank you
Html css javascript
Feb.27,2021

1. If the HTML tag is not initialized, it will bring some margin/padding, so there is a gap

. 
 *{
   margin: 0;
   padding: 0;
   }

2, position:fixed; causes DIV to break away from [document stream], and cannot be full without width:100%;.

it is recommended to add the most basic knowledge to the data: block-level elements, inline elements, inline replacement elements, line height, document stream, CSS priority, and so on.

in my example overflow: auto has completed the work of clearing the float, but not in your case. This < div class= "header-right fr" > < / div > has fallen, it is too much

.

my example 

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    -sharpdev-tool {
      width: 100%;
      height: 200px;
      background-color: -sharpdedede
    }

    -sharpdev-tool * {
      box-sizing: border-box
    }

    -sharpdev-tool .tool-header {
      width: 100%;
      height: 20px;
      background-color: -sharpa5a5a5
    }

    -sharpdev-tool .tool-header .header-left,
    -sharpdev-tool .tool-header .header-right {
      height: 20px;
      width: 60px
    }

    -sharpdev-tool .tool-header .header-mid {
      padding: 0 60px;
      height: 20px
    }

    -sharpdev-tool .tool-header .header-tab {
      display: inline-block;
      padding: 0 4px;
      font-size: 14px;
      line-height: 20px;
      vertical-align: top;
      cursor: pointer
    }

    -sharpdev-tool .tool-header .header-tab:hover {
      background-color: -sharpccc
    }

    -sharpdev-tool .tool-header .header-tab-active {
      background-color: -sharpccc
    }

    -sharpdev-tool .tool-body {
      width: 100%;
      background-color: green;
    }

    -sharpdev-tool .tool-body .tool-container {
      width: 100%;
      height: 100%;
      overflow: auto
    }

    -sharpdev-tool .log-line {
      padding: 5px
    }

    -sharpdev-tool .log-line .log-str,
    -sharpdev-tool .log-line .log-obj {
      word-break: break-all
    }

    -sharpdev-tool .log-line .log-obj {
      background-color: -sharpe4cfcf
    }

    -sharpdev-tool .log-line .log-obj .obj-line {
      padding-left: 4px
    }

    .fl {
      float: left
    }

    .fr {
      float: right
    }

    .fz-12 {
      font-size: 12px
    }

    .fz-14 {
      font-size: 14px
    }

    .error {
      color: red
    }
  </style>
</head>

<body>
  <div id="dev-tool">
    <div class="tool-header">

      <div class="header-left fl">

      </div>
      <div class="header-mid">
        <div class="header-tab" data="console">
        </div>
        <div class="header-tab" data="network">
        </div>
      </div>
      <div class="header-right fr">

      </div>
    </div>
    <div class="tool-body">
      <div class="tool-container" data="console" id="log-board">


      </div>
    </div>

  </div>
  </div>
</body>

</html>

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