用纯css画一个单选勾号（代码如下）

<style>
    .checked {
        margin-top: 200px;
        margin-left: 200px;
        background: red;
        width: 160px;
        height: 160px;
        border-radius: 50%;
        position: relative;
    }
    .checked::after {
        content: "";
        background-color: white;
        width: 50px;
        height: 8px;
        position: absolute;
        top: 100px;
        left: 32px;
        transform: rotate(30deg);
        border-radius: 8px;
    }
    .checked::before {
        content: "";
        background-color: white;
        width: 90px;
        height: 8px;
        position: absolute;
        top: 76px;
        left: 60px;
        transform: rotate(-50deg);
        border-radius: 8px;
    }
</style>

<div class="checked"></div>

显示效果如下图

WX20210612-165357.png