我想用css来改变标题的背景图片的透明度。能请你帮忙吗?
.intro {
display: table;
width: 100%;
height: auto;
padding: 100px 0;
text-align: center;
color: #fff;
background: url(http://lorempixel.com/1910/500/nature/) no-repeat bottom center scroll;
background-color: #000;
-webkit-background-size: cover;
-moz-background-size: cover;
background-size: cover;
-o-background-size: cover;
}
<header class="intro">
...
</header>
filter
:https://developer.mozilla.org/en-US/docs/Web/CSS/filter - connexo