css自定义开关（一个圆里有一个x）

.close:hover{cursor:pointer;}
.close {
background:gray;
color:white;
border-radius: 12px;
line-height: 20px;
text-align: center;
height: 20px;
width: 20px;
font-size: 18px;
padding: 1px;
position:absolute;
left: 91%;
top:-21px;
}

.close::before {
content: "\2716";
}

<div style="height: 80px; width: 80px; border: 1px solid black; position: relative;">
<span class="close"></span>
</div>