html - 如何在 CSS 中创建带有边框的倾斜标签？

Question

我正在尝试创建有角度的标签以位于内容部分上方，并遇到了这个很好的示例：

HTML：

<div class="tab">
    <div class="arrow"></div>
</div>

CSS：

body
{
    background-color: #666;    
}
.tab
{
    height: 50px;
    width: 150px;
    border-radius: 10px 10px 0px 0px;
    background-color: #FFF;
    position: relative;
}

.arrow
{
  border-color: transparent transparent #FFF #FFF;
  border-style: solid;
  border-width: 23px 23px 23px 23px;
  height:0;
  width:0;
  position:absolute;
  bottom:0px;
  right:-43px;
}

http://jsfiddle.net/P3P3Z/2/

但是，我想为这个形状设置一个不同的 2px 边框颜色，不幸的是这种方法不起作用，因为它使用边框来创建形状的右侧。

关于如何修改它的任何想法？

Answer 1

You can try this approach: jsFiddle

Instead of using the borders to create the slanted effect, I'm using an :after pseudo element to create it. This allows me to set borders around it. Then I'm using a :before pseudo element to hide the borders which I don't want to see. The recurring 2px in the CSS is derived from the border width value.

CSS

.tab:before {
    height: 50px;
    width: 10px;
    display: block;
    content:" ";
    background-color: #FFF;
    position: absolute;
    right: -2px;
    top: -2px;
    border-top: 2px solid blue;
    border-bottom: 2px solid blue;
}
.tab {
    height: 50px;
    width: 150px;
    border-radius: 10px 10px 0px 0px;
    background-color: #FFF;
    position: relative;
    border: 2px solid blue;
}
.tab:after {
    display: block;
    content:" ";
    width: 100px;
    height: 50px;
    top: -2px;
    background-color: #FFF;
    position: absolute;
    right: -29px;
    transform:skewX(45deg);
    -ms-transform:skewX(45deg);
    -webkit-transform:skewX(45deg);
    border: 2px solid blue;
    z-index: -1;
}