twitter-bootstrap 调整引导英雄单元上的背景图像不透明度

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时间:2020-10-21 17:11:58  来源:igfitidea点击:

Adjust background image opacity on bootstrap hero unit

csstwitter-bootstrap

提问by vt97john

How can I edit my css to adjust the opacity on the background image in the hero unit without affecting the opacity of the text etc in the hero unit? Here is the draft site (yes i'll be paying for proper version of the photo): site

如何编辑我的 css 以调整英雄单元中背景图像的不透明度,而不影响英雄单元中文本等的不透明度?这是草稿站点(是的,我将为正确版本的照片付费): 站点

回答by Robert McKee

The easy answer is to take your .jpg, and create a .png with it that has your opacity already applied.

简单的答案是获取您的 .jpg,并使用它创建一个 .png,其中已经应用了您的不透明度。

回答by Zim

One way would be to move your hero text outside of the hero unit and use position:relativeto place it where you want...

一种方法是将您的英雄文本移到英雄单位之外,然后将position:relative其放置在您想要的位置...

CSS

CSS

.hero-unit {
  background-image:url('..');
  height:300px;
  opacity: .5;
}

h1 {
  position: relative;
  top: -350px;
  left: 40px;
  color:#fff;
}

HTML

HTML

<div class="container">
  <div class="hero-unit">
  </div>
  <h1>Hello Hero Text</h1>  
</div>

Demo on Bootply

Demo on Bootply

This example assumes your hero text it contained in an H1, but it could be in any container outside of the hero.

此示例假定您的英雄文本包含在 H1 中,但它可以位于英雄之外的任何容器中。