<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
* {
margin: 0;
padding: 0;
}
.box1 {
display: table;
}
.box2 {
display: table-cell;
border: 1px solid #000;
}
.box3 {
width: 1%;
display: table-cell;
background-color: red;
}
/*
box3 = 1%
得出
box2 = 99% box3 = 32px
box2 = 32 * 99 = 3168
body 1366
得出
box2 = body - box3 = 1366 - 32 = 1334
*/
</style>
</head>
<body>
<div class="box1">
<div class="box2">box2</div>
<div class="box3">box3</div>
</div>
</body>
</html>