html - 有什么命令可以覆盖背景图片的img标签的图片吗？

Question

它被插入到 li 类的背景图像中。

里面li类img标签有。

li类标签上的背景图，你怎么占到最上面呢？

<style>
.wrap {
    width: 100%;
    overflow: hidden;
    position: relative;
    height: 625px;
}
.ul-wrap {
    width: auto;
    position: relative;
}
li.full-image.guest_bulr {
    background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAQElEQVQoU2NkIAJ4e3sbMxJSB1K0devWs3gVwhSBDMOpEFkRToXoirAqxKYIQyEuRSgK8SmCKySkCKyQGEUghQBteCUf8jBb4wAAAABJRU5ErkJggg==);
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    width: 980px;
    height: 625px;
    z-index: 999;
    display: none;
    background-color: rgba(21, 18, 18, 0.9);
    zoom: 1;
    background-size: cover;
}

.wrap img {
    max-width: 100%;
    display: block;
}

</style>

<div class="wrap">
    <ul class="ul-wrap">
        <li>
            <img src="http://placehold.it/980x625/?text=image-1st" alt="image" class="first-img">
        </li>
    </ul>
</div>

Answer 1

使用 .first-img 相对。查看工作示例。

.wrap {
    width: 100%;
    overflow: hidden;
    position: relative;
    height: 625px;
}
.ul-wrap {
    width: auto;
    position: relative;
}

.ul-wrap li {
    background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAQElEQVQoU2NkIAJ4e3sbMxJSB1K0devWs3gVwhSBDMOpEFkRToXoirAqxKYIQyEuRSgK8SmCKySkCKyQGEUghQBteCUf8jBb4wAAAABJRU5ErkJggg==);
  display: block; 
  position: relative;
  width: 980px;
  height: 625px;
  background-size: cover;
  background-color: rgba(255, 0, 0, 0.4);
}

.wrap img {
    max-width: 100%;
}

.first-img {
  position: relative;
  z-index: -1;
}

<div class="wrap">
    <ul class="ul-wrap">
        <li>
            <img src="http://placehold.it/980x625/?text=image-1st" alt="image" class="first-img">
        </li>
    </ul>
</div>