不知道写什么欸
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>CSS边框</title>
<style type="text/css">
.box{
width: 500px;
height:500px;
border-top: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ blue;
border-left: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ green;
border-bottom: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ yellow;
border-right: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ red;
border-radius/*圆角*/: 40%;
display: flex;
}
.box1{
width: 400px;
height: 400px;
border-top: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ red;
border-left: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ blue;
border-bottom: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ green;
border-right: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ yellow;
display: flex;
margin: auto auto;
border-radius: 35%;
}
.box2{
width: 300px;
height: 300px;
border-top: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ yellow;
border-left: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ red;
border-bottom: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ blue;
border-right: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ green;
display: flex;
margin: auto auto;
border-radius: 30%;
}
.box3{
width: 200px;
height: 200px;
border-top: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ green;
border-left: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ yellow;
border-bottom: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/red;
border-right: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ blue;
display: flex;
margin: auto auto;
border-radius: 25%;
}
.box4{
width: 100px;
height: 100px;
border-top: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ blue;
border-left: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ green;
border-bottom: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ yellow;
border-right: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)*/ red;
display: flex;
margin: auto auto;
border-radius: 20%;
}
.box5{
height: 20px;
/*border-top: 2px solid/*doyble(双线);dashed(虚线);dotted(点线) blue;
border-left: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)green;
border-bottom: 2px solid/*doyble(双线);dashed(虚线);dotted(点线)yellow;
border-right: 2px solid/*doyble(双线);dashed(虚线);dotted(点线) red; */
box-shadow:0px/*(X方向位置)*/ 2px/*(Y方向位置)*/ 5px/*(阴影宽度)*/ pink/*(颜色)*/;
margin: auto auto;
}
button{
border: none;
margin: auto auto;
}
</style>
</head>
<body>
<div class="box">
<div class="box1">
<div class="box2">
<div class="box3">
<div class="box4">
<button class="box5">登陆</button>
</div>
</div>
</div>
</div>
</div>
</body>
</html>