请实现一个网页网页顶部区域居中显示四个小方块颜色分别是 RED BLUE YELLOW GREEN 方块大小为20px
<!DOCTYPE html>
<html>
<head>
<title>小方块</title>
<style type="text/css">
.container{
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
}
.box{
width: 20px;
height: 20px;
margin: 10px;
}
.red{
background-color: red;
}
.blue{
background-color: blue;
}
.yellow{
background-color: yellow;
}
.green{
background-color: green;
}
</style>
</head>
<body>
<div class="container">
<div class="box red"></div>
<div class="box blue"></div>
<div class="box yellow"></div>
<div class="box green"></div>
</div>
</body>
</html
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