使用定位画广告居中五环

*{
    padding: 0px;
    margin: 0px;
}
.one1{
    position: absolute;
    width: 100px;
    height: 100px;
    border: 10px solid blue;
    border-radius: 50% 
}
.two2{
    position: absolute;
    left: 80px;
    width: 100px;
    height: 100px;
    border: 10px solid black;
    border-radius: 50% 
}
.three3{
    position: absolute;
    left: 160px;
    width: 100px;
    height: 100px;
    border: 10px solid red;
    border-radius: 50% 
}
.four4{
    position: absolute;
    top: 60px;
    left: 40px;
    width: 100px;
    height: 100px;
    border: 10px solid yellow;
    border-radius: 50% 
}
.five5{
    position: absolute;
    top: 60px;
    left: 120px;
    width: 100px;
    height: 100px;
    border: 10px solid green;
    border-radius: 50% 
}
.fivecircles{
    position: fixed;
    left: 50%;
    top: 50%;
    margin-left: -160px;
    margin-top: -100px
}

知识点：
border-radius:圆角属性