html – CSS边框颜色成4种颜色

#header
{
border-color:#88a9eb;
}

您可以使用border-image属性创建具有4种颜色的渐变边框.通常梯度逐渐从一种颜色逐渐移动到另一种颜色,并产生模糊效果,但设置 color-stops(百分比值)使得一种颜色的终点与下一种颜色的起始点相同,使得颜色变为硬停止,从而最终产生阻挡效应.

可以通过更改边框图像宽度和渐变方向将边框设置为所需边.例如,底部边框需要梯度从左到右,而左和右右边界需要梯度从上到下.

梯度使用大小(和颜色停止)的百分比值,因此它们在默认情况下是响应的,并且即使容器的尺寸发生变化,也可以自动调整.

目前使用border-image的唯一缺点是该属性的poor browser support. IE10-不支持此属性.

.bordered-top {
  border-image: linear-gradient(to right,rgb(139,191,64) 25%,rgb(230,27,33) 25%,33) 50%,rgb(124,196,236) 50%,236) 75%,rgb(254,181,17) 75%);
  border-image-slice: 1;
  border-image-width: 4px 0px 0px 0px;
}
.bordered-bottom {
  border-image: linear-gradient(to right,17) 75%);
  border-image-slice: 1;
  border-image-width: 0px 0px 4px 0px;
}
.bordered-left {
  border-image: linear-gradient(to bottom,17) 75%);
  border-image-slice: 1;
  border-image-width: 0px 0px 0px 4px;
}
.bordered-right {
  border-image: linear-gradient(to bottom,17) 75%);
  border-image-slice: 1;
  border-image-width: 0px 4px 0px 0px;
}
div {
  height: 100px;
  width: 300px;
  padding: 10px;
  background: beige;
  margin: 10px;
}

<!-- library added only for old browser support -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js"></script>

<div class='bordered-top'>Border only on top</div>
<div class='bordered-bottom'>Border only on bottom</div>
<div class='bordered-left'>Border only on left</div>
<div class='bordered-right'>Border only on right</div>

对于IE10支持,您可以使用渐变来为background-image属性而不是border-image模仿相同的行为,如下面的代码段所示.

与边框图像不同,这里边框应用的边不能使用border-image-width进行控制,因此我们必须使用背景位置来将图像放置在所需的位置.

背景大小决定边框的厚度.对于顶级&底部边框,x轴中的大小应为100％,y轴中的大小为边框的厚度.对于左和右边框,y轴的大小应为100％,x轴的大小为边框的厚度.

.bordered-top {
  background-image: linear-gradient(to right,17) 75%);
  background-size: 100% 4px;
  background-repeat: no-repeat;
  background-position: 0% 0%;
}
.bordered-bottom {
  background-image: linear-gradient(to right,17) 75%);
  background-size: 100% 4px;
  background-repeat: no-repeat;
  background-position: 0% 100%;
}
.bordered-left {
  background-image: linear-gradient(to bottom,17) 75%);
  background-size: 4px 100%;
  background-repeat: no-repeat;
  background-position: 0% 0%;
}
.bordered-right {
  background-image: linear-gradient(to bottom,17) 75%);
  background-size: 4px 100%;
  background-repeat: no-repeat;
  background-position: 100% 0%;
}
div {
  height: 100px;
  width: 300px;
  padding: 10px;
  background: beige;
  margin: 10px;
}

<!-- library added only for old browser support -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js"></script>

<div class='bordered-top'>Border only on top</div>
<div class='bordered-bottom'>Border only on bottom</div>
<div class='bordered-left'>Border only on left</div>
<div class='bordered-right'>Border only on right</div>