请使用css画一个圆，方法可以多种

<div class="circle"></div>

1.border-radius

.cirlce{ width:10vw; height:10vw; background:gray; border-radius:50%;}

2.clip-path

.circle{ width:10vw; height:10vw; background:gray; clip-path: circle();}

3.svg background

.circle{width:10vw; height:10vw;  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='50%25' cy='50%25' r='50%25' fill='gray'/%3E%3C/svg%3E");}

4.radial-gradient

.circle{ width:10vw; height:10vw;  background:radial-gradient(gray 70%, transparent 70%);}

5.font

.circle::after {    content: "●";    font-size: 10vw;//字体实际大小    line-height: 1;}

6.mix-blend-mode

.circle{ width: 10vw;height: 10vw;background: gray;}.circle::after {    content: "";display: block;width: 10vw;height: 10vw;    mix-blend-mode: lighten;    background: radial-gradient(#000 70%, #fff 70%);}