79.纯 CSS 创作单元素麦当劳金拱门 Logo（自创）

<!-- 定义一个main容器 -->
<div class="main">
    <div class="left"></div>
    <div class="right"></div>
</div>

html, body {
    margin: 0;
    padding: 0;
}
body{
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #400;
    font-size: 20px;
}
.main{
    width: 12em;
    height: 12em;   
    /* border: 1px solid white; */
    background-color: red;
    display: flex;
    justify-content: center;
    position: relative;
    overflow: hidden;
}
.left{
    box-sizing: border-box;
    width: 6em;
    height: 12em;
    border-radius: 50%;
    background-color: withe;
    border-width: 0.7em 1.4em;
    border-style: solid;
    border-color:yellow;
    position: absolute;
    top: 3em;
    left: 0.7em;
}
.right{
    box-sizing: border-box;
    width: 6em;
    height: 12em;
    border-radius: 50%;
    background-color: withe;
    border-width: 0.7em 1.4em;
    border-style: solid;
    border-color:yellow;
    position: absolute;
    top: 3em;
    right: 0.7em;
}
.main::before{
    content: ‘‘;
    position: absolute;
    width: 12em;
    height: 6em;
    /* border: 1px solid white;*/
    background-color: red;
    top: 9em;
    z-index: 999;
}
.main::after{
    content: ‘‘;
    position: absolute;
    width: 6em;
    height: 6em;
    /* border: 1px solid white;*/
    background-color: red;
    top: 8.5em;
    z-index: 999;
}