如何将 CSS 滤镜应用到背景图像

Question

我有一个JPEG文件，用作搜索页面的背景图像，并且我使用CSS来设置它，因为我在Backbone.js上下文中工作：background-image:url("whatever.jpg");我想仅对背景应用CSS3模糊滤镜，但我不确定如何仅设置该元素的样式。如果我尝试：-webkit-filter:blur(5px);-moz-filter:blur(5px);-o-filte

P粉521697419 · Answer

笔

消除对额外元素的需求，同时使内容适合文档流，而不是像其他解决方案那样固定/绝对。

使用实现

.content {
  /* this is needed or the background will be offset by a few pixels at the top */
  overflow: auto;
  position: relative;
}

.content::before {
  content: "";
  position: fixed;
  left: 0;
  right: 0;
  z-index: -1;

  display: block;
  background-image: url('https://i.imgur.com/lL6tQfy.png');
  background-size:cover;
  width: 100%;
  height: 100%;

  -webkit-filter: blur(5px);
  -moz-filter: blur(5px);
  -o-filter: blur(5px);
  -ms-filter: blur(5px);
  filter: blur(5px);
}


Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

编辑如果您有兴趣删除边缘的白色边框，请使用110%的宽度和高度以及-5的左侧和顶部％代码>。这会稍微放大你的背景 - 但不应该有纯色从边缘渗入。感谢查德·福塞特的建议。

.content {
  /* this is needed or the background will be offset by a few pixels at the top */
  overflow: auto;
  position: relative;
}

.content::before {
  content: "";
  position: fixed;
  top: -5%;
  left: -5%;
  right: -5%;
  z-index: -1;

  display: block;
  background-image: url('https://i.imgur.com/lL6tQfy.png');
  background-size:cover;
  width: 110%;
  height: 110%;

  -webkit-filter: blur(5px);
  -moz-filter: blur(5px);
  -o-filter: blur(5px);
  -ms-filter: blur(5px);
  filter: blur(5px);
}


Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

P粉316423089 · Answer

看看这个笔。

您必须使用两个不同的容器，一个用于背景图像，另一个用于您的内容。

在示例中，我创建了两个容器：.background-image 和 .content。

两者都放置为position:fixed和left:0；右：0；。显示它们的差异来自于为元素设置不同的 z-index 值。

.background-image {
  position: fixed;
  left: 0;
  right: 0;
  z-index: 1;
  display: block;
  background-image: url('https://i.imgur.com/lL6tQfy.png');
  width: 1200px;
  height: 800px;
  -webkit-filter: blur(5px);
  -moz-filter: blur(5px);
  -o-filter: blur(5px);
  -ms-filter: blur(5px);
  filter: blur(5px);
}

.content {
  position: fixed;
  left: 0;
  right: 0;
  z-index: 9999;
  margin-left: 20px;
  margin-right: 20px;
}



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