how to design the arrow style when clicking.
draw triangles with the border of pseudo elements in this DIV and locate them.
Demo demo
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.item {
background-color: deepskyblue;
margin-bottom: 8px;
width:160px;
position: relative;
height:40px;
line-height: 40px;
}
.item::after {
content: '';
position: absolute;
left:100%;
width: 0;
height: 0;
border-top: 20px solid transparent;
border-bottom: 20px solid transparent;
border-left: 20px solid deepskyblue;
}
</style>
</head>
<body>
<ul style="list-style: none;">
<li class="item">2+2</li>
<li class="item">1+1</li>
</ul>
</body>
</html>rectangle + triangle is made of border
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