<div class="wrap float">
    <div class="left">我是左边栏</div>
    <div class="right">我是右边栏</div>
    <div class="center">我是float</div>
</div>

<style>

	.wrap > div {
		height: 200px; 
		text-align: center; 
		line-height: 200px; 
	}
	
    .float .left {
      	width: 200px;
      	float: left;
      	background-color: #f00;
    }
    
    .float .center {
      background-color: green;
      margin: 0 200px;
    }
    
    .float .right {
      width: 200px;
      float: right;
      background-color: #ff0;
    }
</style>

<div class="wrap position">
	 <div class="left">我是左边栏</div>
     <div class="center">我是position</div>
	 <div class="right">我是右边栏</div>
</div>

<style>
	.position .left {
        width: 200px;
        position: absolute;
        left: 0;
        background-color: #f00;
      }
      .position .center {
        background-color: green;
        position: absolute;
        left: 200px;
        right: 200px;
      }
      .position .right {
        width: 200px;
        position: absolute;
        right: 0;
        background-color: #ff0;
      }
</style>

<div class="wrap flexbox">
    <div class="left">我是左边栏</div>
   	<div class="center">flexbox</div>
    <div class="right">我是右边栏</div>
</div>

<style>
	.flexbox {display: flex; margin-top: 220px;}
    .flexbox .left {
        width: 200px;
        background-color: #f00;
     }
    .flexbox .center {
        flex: 1;
        background-color: green;
    }
    .flexbox .right {
      width: 200px;
      background-color: #ff0;
    }
</style>

<div class="wrap table">
   	<div class="left">我是左边栏</div>
    <div class="center">table</div>
    <div class="right">我是右边栏</div>
</div>

<style>
	.table {display: table; width: 100%;}
   	.table > div {display: table-cell}
    .table .left {
      width: 200px;
      background-color: #f00;
    }
    .table .center {
      background-color: green;
    }
    .table .right {
      width: 200px;
      background-color: #ff0;
    }
</style>

<div class="wrap grid">
	 <div class="left">我是左边栏</div>
	 <div class="center">grid</div>
	 <div class="right">我是右边栏</div>
</div>

<style>
	.grid {
		display: grid; 
		width: 100%;
		grid-template-rows: 200px;
		grid-template-columns: 200px auto 200px;
	}
    .grid .left {
      background-color: #f00;
    }
    .grid .center {
      background-color: green;
    }
    .grid .right {
      background-color: #ff0;
    }
</style>
<div class="wrap grid">
	 <div class="left">我是左边栏</div>
	 <div class="center">grid</div>
	 <div class="right">我是右边栏</div>
</div>