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console 命令行工具 X clear 

                    

                        
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console

            
<style>
    div{display: inline-block;}
    .main{width:100%;}
    .left{width:200px;background:green;}
    .right{width:calc(100% - 200px);background:blue;}
</style>
<div class="main">
    <div class="left">固定200px宽度<br>固定200px宽度<br>固定200px宽度<br></div><div class="right">自动适用剩余</div>
</div>