使 CSS 背景图片变暗

Question

我想将背景图片调暗。我发现我必须使用不透明度，所以我写了我的 css 代码：

body {
        width: 960px;
        margin: 0 auto;
        font-family: Georgia, Times, serif;
        background:
        linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)),
        url('../pics/parachute.jpg');}

一切正常！但是当我添加一些标志来制作全屏背景图片时，我的效果就消失了。

body {
        width: 960px;
        margin: 0 auto;
        font-family: Georgia, Times, serif;
        background:
        linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)),
        url('../pics/parachute.jpg');
        -webkit-background-size: cover;
        -moz-background-size:  cover;
        -o-background-size: cover;
         background-size: cover;}

它不起作用的原因是什么？

Answer 1

这就是您可以在不丢失任何应用效果的情况下使背景图像变暗的方法。

   

    .bg{
      background: url('http://res.cloudinary.com/wisdomabioye/image/upload/v1462961781/about_vbxvdi.jpg');
      height: 500px;
      -webkit-background-size: cover;
      -moz-background-size:  cover;
      -o-background-size: cover;
       background-size: cover;
    }
    .content{
      background: rgba(0,0,0,0.4);
      color: white;
      height: inherit;
      padding-left: 10px;
    }

<div class='bg'>
        
   <div class='content'>
     <p>
        Some content Some content Some content Some                content Some content Some Some content Some content Some content Some content Some content Some Some content Some content Some content Some content Some content Some Some content Some content Some content Some content Some content Some Some content Some content Some content Some content Some content Some Some content Some content Some content Some content Some content Some Some content Some content Some content Some content Some content Some Some content Some content Some content Some content Some content Some Some content Some content Some content Some content Some content Some 
 
    </p> 
  </div> 
 </div>

使 CSS 背景图片变暗

Darkening a CSS background image

html

css

background-image

opacity