用CSS代码写出的各种形状图形的方法

background: #eee;
border: 18px solid red;
border-radius: 100%;
width: 12px;
height: 12px;
}

 
#yin-yang:after {
content: "";
position: absolute;
top: 50%;
left: 50%;
background: red;
border: 18px solid #eee;
border-radius:100%;
width: 12px;
height: 12px;
}