<!--Background opacity--> <style> .container1 { width: 200px; height: 200px; background: rgba(0, 0, 0, .5); margin-bottom: 50px; } </style> <div class="container1"> <div class="box1">Text</div> </div> <!--Before, after, z-index opacity--> <style> .container2 { width: 200px; height: 200px; position: relative; margin-bottom: 100px; } .container2:after { content: ''; display: block; width: 100%; height: 100%; position: absolute; top: 0; left: 0; background: black; opacity: .5; z-index: 1; } .box2 { position: relative; z-index: 2; } </style> <div class="container2"> <div class="box2">Text</div> </div> <!--Outline opacity--> <style> .container3 { width: 200px; height: 200px; outline: 50px solid rgba(0, 0, 0, .5); margin: 50px; } .box3 { position: relative; left: -16px; } </style> <div class="container3"> <div class="box3">Text</div> </div>

这个问题没有定义背景是颜色还是图像，但由于@Blowski已经回答了彩色背景，下面有一个针对图像的破解方法:

background: linear-gradient(rgba(0,0,0,.6), rgba(0,0,0,.6)), url('image.jpg');

这样你就可以操纵不透明度的颜色，甚至添加漂亮的渐变效果。

.wrapper { 宽度:630 px; 身高:420 px; 显示:表; 背景:线性渐变( rgba(0, 0, 0, 0。8), rgba(0, 0, 0, 0。8)), url (http://cdn.moviestillsdb.com/sm/35bc3c6a2b791425de6caf8b9391026e/rambo-iii.jpg); ｝ h1 { 显示:表格单元; vertical-align:中间; text-align:中心; 颜色:# fff; ｝ < div class = "包装" > <标题> 5770341 < / h1 >问题 < / div >

递归地为子对象分配不透明度1.0:

div > div { opacity: 1.0 }

Example: div.x { opacity: 0.5 } div.x > div.x { opacity: 1.0 } <div style="background-color: #f00; padding:20px;"> <div style="background-color: #0f0; padding:20px;"> <div style="background-color: #00f; padding:20px;"> <div style="background-color: #000; padding:20px; color:#fff"> Example Text - No opacity definition </div> </div> </div> </div> <div style="opacity:0.5; background-color: #f00; padding:20px;"> <div style="opacity:0.5; background-color: #0f0; padding:20px;"> <div style="opacity:0.5; background-color: #00f; padding:20px;"> <div style="opacity:0.5; background-color: #000; padding:20px; color:#fff"> Example Text - 50% opacity inherited </div> </div> </div> </div> <div class="x" style="background-color: #f00; padding:20px;"> <div class="x" style="background-color: #0f0; padding:20px;"> <div class="x" style="background-color: #00f; padding:20px;"> <div class="x" style="background-color: #000; padding:20px; color:#fff"> Example Text - 50% opacity not inherited </div> </div> </div> </div> <div style="opacity: 0.5; background-color: #000; padding:20px; color:#fff"> Example Text - 50% opacity </div>

以下是对我有用的:

改变了

来自:

opacity: 0.52;
background-color: #7c7c7c;

To:

opacity: 1 !important;
background-color: rgba(124, 124, 124, 0.52) !important;

要将十六进制和不透明度转换为rgba， 使用http://hex2rgba.devoth.com/这样的网站

不要使用不透明度，使用rgba设置背景颜色，其中“a”是透明度级别。

所以不要:

background-color: rgb(0,0,255); opacity: 0.5;

use

background-color: rgba(0,0,255,0.5);

上面的答案对我来说似乎很复杂，所以我写了这个:

#kb-mask-overlay { background-color: rgba(0,0,0,0.8); width: 100%; height: 100%; z-index: 10000; top: 0; left: 0; position: fixed; content: ""; } #kb-mask-overlay > .pop-up { width: 800px; height: 150px; background-color: dimgray; margin-top: 30px; margin-left: 30px; } span { color: white; } <div id="kb-mask-overlay"> <div class="pop-up"> <span>Content of no opacity children</span> </div> </div> <div> <p> Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin vitae arcu nec velit pharetra consequat a quis sem. Vestibulum rutrum, ligula nec aliquam suscipit, sem justo accumsan mauris, id iaculis mauris arcu a eros. Donec sem urna, posuere id felis eget, pharetra rhoncus felis. Mauris tellus metus, rhoncus et laoreet sed, dictum nec orci. Mauris sagittis et nisl vitae aliquet. Sed vestibulum at orci ut tempor. Ut tristique vel erat sed efficitur. Vivamus vestibulum velit condimentum tristique lacinia. Sed dignissim iaculis mattis. Sed eu ligula felis. Mauris diam augue, rhoncus sed interdum nec, euismod eget urna. Morbi sem arcu, sollicitudin ut euismod ac, iaculis id dolor. Praesent ultricies eu massa eget varius. Nunc sit amet egestas arcu. Quisque at turpis lobortis nibh semper imperdiet vitae a neque. Proin maximus laoreet luctus. Nulla vel nulla ut elit blandit consequat. Nullam tempus purus vitae luctus fringilla. Nullam sodales vel justo vitae eleifend. Suspendisse et tortor nulla. Ut pharetra, sapien non porttitor pharetra, libero augue dictum purus, dignissim vehicula ligula nulla sed purus. Cras nec dapibus dolor. Donec nulla arcu, pretium ac ipsum vel, accumsan egestas urna. Vestibulum at bibendum tortor, a consequat eros. Nunc interdum at erat nec ultrices. Sed a augue sit amet lacus sodales eleifend ut id metus. Quisque vel luctus arcu. </p> </div>

Kb-mask-overlay是你的(不透明度)父母，弹出是你的(不透明度)孩子。它下面的所有内容都是站点的其余部分。