使图像叠加层变暗，并在CSS中添加文字 [英] Darken image overlay and add text over it in CSS

问题描述

我将如何使该图像变暗(添加一个半透明的覆盖层)并向该图像添加文本(但水平和垂直居中)，如下所示:

How would I darken (add a semi-transparent overlay) and add text to this image (but centred horizontally and vertically) as below:

HTML

<img src="http://luxurylaunches.com/wp-content/uploads/2014/05/uber-london.jpg" id="top" data-appear-animation="fadeIn">

CSS

#top {
width: 100%;
height: auto;
}
body {
margin: 0px;
}

在这里拨弄: http://jsfiddle.net/6jf0nxd5/

推荐答案

要将文本水平和垂直居中，您需要将其包装在带有text-align:center;的容器中.然后，您可以使用伪元素将其垂直居中.对于覆盖层，可以为文本容器提供rgba()背景颜色，该颜色可以具有透明性:

To center the text horizontaly and verticaly, you will need to wrap it in a container with text-align:center;. Then you can use a pseudo element to center it verticaly. For the overlay, you can give the text container a rgba() background color that can have transparency :

演示

DEMO

body {
    margin: 0px;
}
.wrap{
    position:relative;
}
.wrap img{
    width:100%;
    height:auto;
    display:block;
}
.text{
    position:absolute;
    top:0; left:0;
    width:100%; height:100%;
    background:rgba(255,255,255,.5);
    text-align:center;
}
.text:after{
    content:'';
    width:1px; height:100%;
    vertical-align:middle;
    display:inline-block;
}
.text span{
    display:inline-block;
    vertical-align:middle;
}

<div class="wrap">
    <img src="http://luxurylaunches.com/wp-content/uploads/2014/05/uber-london.jpg" id="top" data-appear-animation="fadeIn" />
    <div class="text"><span>Text over the image
        <br/>Second line</span></div>
</div>

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