为4个边框中的每个边框创建边框渐变

Question

我想为每个边框创建相同的线性渐变。

5种颜色的边框渐变从

开始

transparent to white to black to white to transparent

这样我就有了透明的角落。

如何为所有4个边框执行此操作？

是否可以为边框指定线性渐变？

旁注：它应该在没有太多努力的情况下运行IE9 +其他IE10 +：P

Answer 1

如何使用径向渐变？虽然这只是一个模拟，但你可以看到基本效果。

.outer {
  vertical-align:top;
  display:inline-block;
  height: 100px;
  width: 100px;
  position: relative;
background: -moz-radial-gradient(center, ellipse cover,  rgba(0,0,0,1) 1%, rgba(0,0,0,1) 50%, rgba(0,0,0,0) 90%, rgba(0,0,0,0) 99%, rgba(0,0,0,0) 100%); /* FF3.6+ */
background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(1%,rgba(0,0,0,1)), color-stop(50%,rgba(0,0,0,1)), color-stop(90%,rgba(0,0,0,0)), color-stop(99%,rgba(0,0,0,0)), color-stop(100%,rgba(0,0,0,0))); /* Chrome,Safari4+ */
background: -webkit-radial-gradient(center, ellipse cover,  rgba(0,0,0,1) 1%,rgba(0,0,0,1) 50%,rgba(0,0,0,0) 90%,rgba(0,0,0,0) 99%,rgba(0,0,0,0) 100%); /* Chrome10+,Safari5.1+ */
background: -o-radial-gradient(center, ellipse cover,  rgba(0,0,0,1) 1%,rgba(0,0,0,1) 50%,rgba(0,0,0,0) 90%,rgba(0,0,0,0) 99%,rgba(0,0,0,0) 100%); /* Opera 12+ */
background: -ms-radial-gradient(center, ellipse cover,  rgba(0,0,0,1) 1%,rgba(0,0,0,1) 50%,rgba(0,0,0,0) 90%,rgba(0,0,0,0) 99%,rgba(0,0,0,0) 100%); /* IE10+ */
background: radial-gradient(ellipse at center,  rgba(0,0,0,1) 1%,rgba(0,0,0,1) 50%,rgba(0,0,0,0) 90%,rgba(0,0,0,0) 99%,rgba(0,0,0,0) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#000000', endColorstr='#00000000',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */


}
.inner {
  height: 90%;
  width: 90%;
  position: absolute;
  left: 5%;
  top: 5%;
  background: white;
}

<div class="outer">
  <div class="inner">
    text
  </div>
</div>
<div class="outer" style="height:100px; width:200px">
  <div class="inner">
    text
  </div>
</div>

---

<强>资源

---

• 1 * gradient generator

---

注意

---

• 不适合<=IE9
的项目

Answer 2

您也可以使用多个线性渐变作为背景，并根据需要定位它们，如下面的代码段所示。

要更改边框的大小/宽度，请修改background-size中的20px值。 （注意：根据所需的输出，您可能还需要在更改大小时更改线性渐变百分比。但这应该是相当简单的。）

background-size: 100% 20px, 100% 20px, 20px 100%, 20px 100%;

整体have no support in IE 9的渐变，但应该在IE 10+中工作。另一方面，Border-image仅适用于IE 11以上。

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.border-image {
  height: 200px;
  width: 200px;
  background: -webkit-linear-gradient(0deg, transparent 10%, white 10%, black 50%, white 90%, transparent 90%), -webkit-linear-gradient(0deg, transparent 10%, white 10%, black 50%, white 90%, transparent 90%), -webkit-linear-gradient(90deg, transparent 10%, white 10%, black 50%, white 90%, transparent 90%), -webkit-linear-gradient(90deg, transparent 10%, white 10%, black 50%, white 90%, transparent 90%);
  background: -moz-linear-gradient(0deg, transparent 10%, white 10%, black 50%, white 90%, transparent 90%), -moz-linear-gradient(0deg, transparent 10%, white 10%, black 50%, white 90%, transparent 90%), -moz-linear-gradient(90deg, transparent 10%, white 10%, black 50%, white 90%, transparent 90%), -moz-linear-gradient(90deg, transparent 10%, white 10%, black 50%, white 90%, transparent 90%);
  background: linear-gradient(90deg, transparent 10%, white 10%, black 50%, white 90%, transparent 90%), linear-gradient(90deg, transparent 10%, white 10%, black 50%, white 90%, transparent 90%), linear-gradient(0deg, transparent 10%, white 10%, black 50%, white 90%, transparent 90%), linear-gradient(0deg, transparent 10%, white 10%, black 50%, white 90%, transparent 90%);
  background-repeat: no-repeat, no-repeat, no-repeat, no-repeat;
  background-size: 100% 20px, 100% 20px, 20px 100%, 20px 100%;
  background-position: 0px 0px, 0px 100%, 0px 0px, 100% 0px;
  padding: 20px;
}

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<div class="border-image">Some Test Content</div>

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