leslie1943/blog

CSS: 用CSS实现一个三角形

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leslie1943 commented

三角形基本思路

  1. width 和 height 都为 0px
  2. 分别设置容器的border,其中任意三个border的可见度为0即可
.box {
  width: 0px;
  height: 0px;
  border-top: 20px solid rgba(48, 31, 141, 0);
  border-right: 20px solid rgba(29, 114, 117, 1);
  border-bottom: 20px solid rgba(170, 22, 136, 0);
  border-left: 20px solid rgba(144, 175, 29, 1);
}
```

### demo
```html
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Document</title>
    <style>
        .box {
            margin: 0 auto;
            width: 0px;
            height: 0px;
            border-top: 20px solid rgba(48, 31, 141, 0);
            border-right: 20px solid rgba(29, 114, 117, 1);
            border-bottom: 20px solid rgba(170, 22, 136, 0);
            border-left: 20px solid rgba(144, 175, 29, 1);
        }
    </style>
</head>

<body>
    <div class="box"></div>

</body>

</html>
```