SOURCE

<!-- <div class="pa">
	<div class="c1">1234qwer气味儿</div>
	<div class="c2">1234qwer气味儿</div>

</div> -->

*{
   height: 100%;
    width: 100%;  
     background-color: black;
}

/* .pa{
    overflow: hidden;
    height: 100%;
    width: 100%;
} */

.c1{
    height: 100%;
    width: 100px;
    background-color: brown;
    float: left;
    margin: 20px;
}

.c2{
    height: 100%;
    width: 100%;
    background-color: yellow;
    margin-left: 140px;
}