<div class= "container">
<div class="left"></div>
<div class="right"></div>
</div>
<style>
/*方法一： BFC(块级格式化上下文)*/
.container{
width:1000px;
height:400px;
border: 1px solid red;
}
.left{
width:200px;
height:100%;
background: gray;
float: left;
}
.right{
overflow:hidden; /* 触发bfc */
background: green;
}
/*方法二： flex布局 */
.container{
width:1000px;
height:400px;
border:1px solid red;
display:flex; /*flex布局*/
}
.left{
width:200px;
height:100%;
background:gray;
flex:none;
}
.right{
height:100%;
background:green;
flex:1; /*flex布局*/
}
/* 方法三： table布局 */
.container{
width:1000px;
height:400px;
border:1px solid red;
display:table; /*table布局*/
}
.left{
width:200px;
height:100%;
background:gray;
display:table-cell;
}
.right{
height:100%;
background:green;
display: table-cell;
}
/*方法四： css计算宽度calc*/
.container{
width:1000px;
height:400px;
border:1px solid red;
}
.left{
width:200px;
height:100%;
background:gray;
float:left;
}
.right{
height:100%;
background:green;
float:right;
width:calc(100% - 200px);
}
/*方法五： margin-left方式*/
.container{
width:1000px;
height:400px;
border:1px solid red;
}
.left{
float:left;
width:200px;
border:1px solid red;
height:100%;background:gray;
}
.right{
height:100%;
border:1px solid blue;
width:auto;
margin-left:200px;
}
</style>