html - 在图像上应用 CSS Alpha 叠加层

Question

我正在尝试在图像上应用 alpha 叠加层。现在，它应用于整个页面主体，而不仅仅是图像。帮忙？

http://jsfiddle.net/21ku3o7f/

<div class="dimmed">
    <img src="http://placehold.it/300x300" />
</div>

.dimmed:after {
  content: " ";
  z-index: 10;
  display: block;
  position: absolute;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.3);
}

Answer 1

这应该可以解决问题:http://jsfiddle.net/21ku3o7f/1/

<div class="dimmed">
  <img src="http://placehold.it/300x300" />
</div>

.dimmed {
  display: inline-block;
  position: relative;
}
.dimmed:after {
  content: " ";
  z-index: 10;
  display: block;
  position: absolute;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.3);
}
.dimmed img {
  display: block;
}