css偽元素寫三角形
阿新 • • 發佈:2021-01-05
父元素 #demo{ margin: 100px; width: 100px; height: 100px; border: 1px solid black; position: relative; } //右三角 #demo:before{ content:""; width:0; height:0; position: absolute; top: 34px; left: 100px; border-top:solid 15px transparent; border-left:solid 15px black ; border-bottom:solid 15px transparent; } //上三角(對應修改為) border-right:solid 15px transparent; border-left:solid 15px transparent; border-bottom:solid 15px black; //下三角(對應修改為) border-top:solid 15px black; border-right:solid 15px transparent; border-left:solid 15px transparent; //左三角(對應修改為) border-top:solid 15px transparent; border-right:solid 15px black; border-bottom:solid 15px transparent;