<style>
.out{
width: 400px;
height: 400px;
background-color:hsla(240,100%,50%,0.4);
margin:100px auto;
border: 1px solid #000;
}
.in{
width: 200px;
height: 200px;
background-color: red;
margin:100px auto;
}
.other{
width: 300px;
height: 300px;
border: 30px solid rgba(0,255,0,0.3);
font-size:50px;
font-family:"Microsoft Yahei";
background-color: rgba(255,0,0,0.3);
color:rgba(0,0,255,0.4);
}
</style>
</head>
<body>
<div class="out">
<div class="in"></div>
</div>
<div class="other">
ABCD
</div>
</body>
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