答案 0 :(得分:0)
body {
padding:0;
margin:0;
}
.blue_cont {
height:300px;
width:90%;
margin:200px auto 0;
background:royalblue;
position:relative;
}
.green_cont {
position:absolute;
width:50%;
height:300px;
background:green;
bottom:100px;
left:100px;
}
<div class="blue_cont">
<div class="green_cont">
</div>
</div>