如何添加背景图像的叠加

Question

我想在具有背景图像的div上添加一个覆盖。divs将从php生成。每个div都有一个背景图像。

当我尝试在有背景图像的div上添加渐变覆盖时，我看不到任何变化。

我该怎么做呢？

以下是我尝试过的方法

Html

<div class="image-box" style="background-image:url(images/stacks.jpg);"></div>
<div class="image-box" style="background-image:url(images/random.jpg);"></div>
<div class="image-box" style="background-image:url(images/laos.jpg);"></div>
<div class="image-box" style="background-image:url(images/thai.jpg);"></div>
<div class="image-box" style="background-image:url(images/phils.jpg);"></div>
<div class="image-box" style="background-image:url(images/tabs.jpg);"></div>

Css

.image-box:hover{
    background-image:linear-gradient(to bottom, rgba(9, 37, 70, 0.1),rgba(9, 37, 70, 0.4),rgba(9, 37, 70, 0.8));
}

Answer 1

愿这对你有所帮助。试试看：

最初，我添加了一个伪元素::after作为覆盖，并分配了与image-box相同的大小，最初它的display: none;在悬停时更改为display: block;，仅在悬停时应用覆盖。

​

.image-box {
  position: relative;
  display: inline-block;
  height: 200px;
  width: 200px;
}
.image-box::after {
    position: absolute;
    top: 0;
    left: 0;
    display: none;
    height: 100%;
    width: 100%;
    background:linear-gradient(to bottom, rgba(9, 37, 70, 0.1),rgba(9, 37, 70, 0.4),rgba(9, 37, 70, 0.8));
    content: '';
}
.image-box {
  position: relative;
  display: inline-block;
  height: 200px;
  width: 200px;
}
.image-box:hover::after {
    display: block;
}

<div class="image-box" style="background-image:url(https://cdn.pixabay.com/photo/2018/06/30/09/31/background-image-3507320__340.jpg);"></div>
<div class="image-box" style="background-image:url(https://cdn.pixabay.com/photo/2018/06/30/09/31/background-image-3507320__340.jpg);"></div>
<div class="image-box" style="background-image:url(https://cdn.pixabay.com/photo/2018/06/30/09/31/background-image-3507320__340.jpg);"></div>
<div class="image-box" style="background-image:url(https://cdn.pixabay.com/photo/2018/06/30/09/31/background-image-3507320__340.jpg);"></div>
<div class="image-box" style="background-image:url(https://cdn.pixabay.com/photo/2018/06/30/09/31/background-image-3507320__340.jpg);"></div>
<div class="image-box" style="background-image:url(https://cdn.pixabay.com/photo/2018/06/30/09/31/background-image-3507320__340.jpg);"></div>

​