html构造
<body> <div class="wrapper"> <div class="left"></div> <div class="right"></div> </div> </body>办法一：flex布局
.wrapper{ display:flex;}.left{ width:200px; height:400px; background:black;}.right{ flex:1; height:400px; background:red;}办法二：浮动
.left{ float:left; width:200px; height:400px; background:black;}.right{ background:red; height:400px;}办法三：BFC
.left{ width:200px; height:400px; float:left; background:black;}.right{ overflow:hidden; height:400px; background:red;}办法四：position相对定位
.wrapper{ position:relative;}.left{ width:200px; height:400px; background:black;}.right{ position:absolute; top:0; left:200px; right:0; bottom:0; background:red;}办法五：table布局
.wrapper{ display:table; width:100%;}.left,.right{ display:table-cell; height:400px}.left{ background:black;}.right{ background:red;}办法六：grid布局
.wrapper{ display:grid; width:100%; height:400px; grid-template-columns:200px auto;}.left{ background:black;}.right{ background:red;}