纯CSS实现箭头，圆点，三角形。_html/css_WEB-ITnose

.goback {      position: absolute;      top: 18px;      left: 18px;      border: 10px solid transparent;      border-right: 10px solid #ccc;    }        .goback:hover {      border-right: 10px solid #808080;    }        .goback:after {      content: '';      position: absolute;      top: -10px;      left: -7px;      border: 10px solid transparent;      border-right: 10px solid #fff;    } 

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