奥运五环
把奥运五环做成一个浮动,总是位于屏幕中央的效果。
难点
定位的练习 position :fixed
位于body中间的时候 left:50%;top:50%;
css内部样式表的使用 style="text/css"
代码
<!DOCTYPE html>
<html >
<head>
<meta charset="UTF-8">
<title>居中五环</title>
<style type="text/css">
.a1,.a2,.a3,.a4,.a5{
position:absolute;
width: 100px;
height: 100px;
background-color: transparent;
border: 10px solid;
border-radius: 110px;
}
.plat{
position: fixed;
top: 50%;
left: 50%;
margin-left:-140px;
margin-top: -70px;
width: 280px;
height: 140px;
}
.a1{
border-color: blue;
left: 0;
top: 0;
}
.a2{
border-color: black;
top: 0px;
left: 130px;
z-index: 4;
}
.a3{
border-color: yellow;
top: 0px;
left: 260px;
z-index: 4;
}
.a4{
border-color: red;
top: 65px;
left: 65px;
z-index: 5;
}
.a5{
border-color: green;
top: 65px;
left: 198px;
z-index: 6;
}
</style>
<body>
<div class ="plat">
<div class="a1"></div>
<div class="a2"></div>
<div class="a3"></div>
<div class="a4"></div>
<div class="a5"></div>
<div>
</body>
</html>