css画正六边形的两种方法

.div {
                position: relative;
                width: 50px;
                height: 86.6px;
                margin: 50px auto;
                background-color: red;
            }
            .div:before {
                content: '';
                display: block;
                position: absolute;
                width: 0;
                height: 0;
                right:50px;
                border-width: 43.3px 25px;
                border-style: solid;
                border-color: transparent red transparent transparent;
            }
            .div:after {
                content: '';
                display: block;
                position: absolute;
                width: 0;
                height: 0;
                left:50px;
                border-width: 43.3px 25px;
                border-style: solid;
                border-color: transparent transparent transparent red;
                :0;
            }

<div class='div-2'>
    <div class='one'></div>
    <div class='two'></div>
    <div class='three'></div>
</div>

.one {
                width: 50px;
                height: 86.6px;
                margin: 0 auto;
                border-: 1px solid red;
                border-bottom: 1px solid red;
            }
            .two {
                position: absolute;
                width: 50px;
                height: 86.6px;
                left: 25px;
                : 0;
                transform: translate(-50%,-50%);
                transform: rotate(60deg);
                border-: 1px solid red;
                border-bottom: 1px solid red;
            }
            .three {
                position: absolute;
                width: 50px;
                height: 86.6px;
                left: 25px;
                : 0;
                transform: translate(-50%,-50%);
                transform: rotate(300deg);
                border-: 1px solid red;
                border-bottom: 1px solid red;
            }