Baidu-task/task4.html at master · HelloLeeChan/Baidu-task · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Task4</title>
 <style>
 *, *:before, *:after {
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box
}
html, body {
	height: 100%;
	width: 100%;
	margin: 0;
	padding: 0;
	overflow: hidden;
}

.outer {
  position:relative;
  display:table;
  width:100%;
  height:100%;
  border:  solid black;
}

.inner {
    margin:auto ;
	position: absolute;
   top: 0; left: 0; bottom: 0; right: 0;
	width:400px ;
	height: 200px ;
	background:#CCC ;
}
.circle-top {
	width:50px;
	height:50px;
	background:#fc0;
	border-bottom-right-radius: 50px;
}

.circle-bottom {
	float:right;
	margin-top:100px;
	width:50px;
	height:50px;
	background:#fc0;
	border-top-left-radius: 50px;
}

</style>
</head>
<body>
   <div class = 'outer'>
  <div class = 'inner'>
      <div class="circle-top"></div>
       <div class="circle-bottom"></div>
  </div>
</div>
</body>
</html>