如何向（8点星）css形状添加边框？ [英] How do I add a border to an (8 point star) css shape?

问题描述

如何在此8点星形外添加红色边框？还是有一个简单的svg解决方案任何人都知道？

How do I add a red border outside this 8 point star? Or is there a simple svg solution anyone knows of?

IS：

需要：

JS fiddle

HTML

<div id="star8"></div>

CSS

#star8 {
 border: 3px solid red;
 background: blue; width: 80px;
 height: 80px;
 position: relative;
 -webkit-transform: rotate(20deg);
 -moz-transform: rotate(20deg);
 -ms-transform: rotate(20deg);
 -o-transform: rotate(20eg);
 }
#star8:before {
 content: "";
 position: absolute;
 top: 0;
 left: 0;
 height: 80px;
 width: 80px;
 background: blue;
 -webkit-transform: rotate(135deg);
 -moz-transform: rotate(135deg);
 -ms-transform: rotate(135deg);
 -o-transform: rotate(135deg);
 }

推荐答案

=https://developer.mozilla.org/fr/docs/Web/CSS/Reference/mix-blend-mode>混合混合模式，最终其他伪： DEMO

you may use mix-blend-mode and eventually the other pseudo : DEMO

#star8:after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 80px;
  width: 80px;
  transform: rotate(135deg);
  box-shadow: 0 0 0 3px red;::* a border works too */
  mix-blend-mode:overlay;
}

#star8 {
  margin: 2em;
  border: 3px solid red;
  background: blue;
  width: 80px;
  height: 80px;
  position: relative;
  transform: rotate(20deg);
}

#star8:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 80px;
  width: 80px;
  background: blue;
  transform: rotate(135deg);
}

#star8:after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 80px;
  width: 80px;
  transform: rotate(135deg);
  box-shadow: 0 0 0 3px red;
  mix-blend-mode:overlay;
}

<div id="star8"></div>

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