写一个html显示上下、左右居中的圆50px50px绿色圆上居中显示启动IE
<!DOCTYPE html>
<html>
<head>
<style>
.container {
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
}
<p>.circle {
width: 50px;
height: 50px;
background-color: green;
border-radius: 50%;
display: flex;
justify-content: center;
align-items: center;
}
</style></p>
</head>
<body>
<div class="container">
<div class="circle">
启动IE
</div>
</div>
</body>
</html>
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