console 命令行工具 X clear

console

<html>
<body>
<div class="box">
     <div class="Lbox"></div>
    <div class="Mbox"></div>
    <div class="Rbox"></div>
</div>
</body>
</html>

* {
    box-sizing: border-box;
    font-size: 24px;
    text-align: center;
}
.box {
    display: flex;
    width: 100%;
    height: 100px;
    border: #000000 1px solid;
    justify-content: space-evenly;
}
.Lbox, .Rbox {
    width: 200px;
    background-color: #fff000;
}
.Mbox {
    flex:1;
    background-color: #ffffff;
}