2个div左右铺满整个浏览器，左边div一直保持100px，右边的div跟随浏览器大小变化

方法一：使用flex

效果如图所示：

<div class="box">  <div class="left"></div>  <div class="right"></div></div>

*{  margin:0;  padding:0;}.box {/*     width: 400px; */    height: 100px;    display: flex;    flex-direction: row;    align-items: center;    border: 1px solid #c3c3c3;}.left {    flex-basis：100px;    -webkit-flex-basis: 100px;    /* Safari 6.1+ */    background-color: red;    height: 100%;}.right {    background-color: green;    flex-grow: 1;  height: 100%;}

方法二：浮动布局

效果如图所示：

<div id="left">Left</div><div id="right">Right</div>

* {    margin: 0;    padding: 0;}#left {    float: left;    width: 100px;  height:100px;    background-color: green;  text-align:center;  line-height:100px;  color:#fff;}#right {    background-color: orange;    margin-left: 100px;    text-align:center;  height:100px;  line-height:100px;}