Question

我已经创建了这些按钮图像。我试图做到这一点，以便当用户将鼠标悬停在图像上时，img元素的不透明度会发生变化，而顶部的元素（例如span和h2元素）则完全不透明（可见）。我将img元素专门定位在css中的悬停上，但是由于某些原因，所有元素的不透明度都发生了变化。为什么会这样呢？我在做什么错，我该如何解决？代码如下。

body {
  background-color: black;
}

.featured-list li {
  display: inline-block;
  margin-right: .8%;
}

.featured-list a {
  display: block;
}

.featured-list {
  text-align: center;
  padding: 0;
  margin: 0 auto;
}

a.feature-img img {
  width: 425px;
  border-radius: 5px;
}

a.feature-img {
  text-align: center;
}


.f-cta, .f-img-content h2 {
  font-family: 'Abel',Helvetica,Arial,Lucida,sans-serif;
  font-weight: 100;
  position: absolute;
  left: 0;
  right: 0;
  margin: 0 auto;
}

.f-img-content h2 {
  color: #fff;
  top: 34%;
}

.f-cta {
  background: #fff;
  width: 50%;
  border-radius: 3px;
  padding: 7px;
  color: #000;
  top: 48%;
  font-size: 1.3em;
}

.f-img-content {
  position: relative;
  text-align: center;
  overflow: hidden;
}

a.feature-img:hover img {
  opacity: .6;
}

<ul class="featured-list">
      <li><a href="#" class="feature-img">
        <div class="f-img-content">
          <h2>Lorem Ipsum project title</h2>
          <span class="f-cta">View Project</span>
          <img src="https://i.imgur.com/EENJU66.gif">
        </div>   
      </a></li>
      <li><a href="#" class="feature-img">
      <img src="https://i.imgur.com/EENJU66.gif">
      </a></li>
      <li><a href="#" class="feature-img">
      <img src="https://i.imgur.com/EENJU66.gif">
      </a></li>
      <li><a href="#" class="feature-img">
      <img src="https://i.imgur.com/EENJU66.gif">
      </a></li>
    </ul>

Answer 1

更改元素的顺序，因此图像是第一位，然后是h2和span。这样可以解决问题。

  <img src="https://i.imgur.com/EENJU66.gif">
  <h2>Lorem Ipsum project title</h2>
  <span class="f-cta">View Project</span>

Answer 2

看起来像z-index issue。只需将z-index:1添加到.cta和h2。

opacity的更改正在影响堆叠顺序，将半透明图像放在内容顶部。调整内容的z-index可解决此问题。

body {
  background-color: black;
}

.featured-list li {
  display: inline-block;
  margin-right: .8%;
}

.featured-list a {
  display: block;
}

.featured-list {
  text-align: center;
  padding: 0;
  margin: 0 auto;
}

a.feature-img img {
  width: 425px;
  border-radius: 5px;
}

a.feature-img {
  text-align: center;
}

.f-cta,
.f-img-content h2 {
  font-family: 'Abel', Helvetica, Arial, Lucida, sans-serif;
  font-weight: 100;
  position: absolute;
  left: 0;
  right: 0;
  margin: 0 auto;
  z-index: 1;
}

.f-img-content h2 {
  color: #fff;
  top: 34%;
}

.f-cta {
  background: #fff;
  width: 50%;
  border-radius: 3px;
  padding: 7px;
  color: #000;
  top: 48%;
  font-size: 1.3em;
}

.f-img-content {
  position: relative;
  text-align: center;
  overflow: hidden;
}

a.feature-img:hover img {
  opacity: .6;
}

<ul class="featured-list">
  <li>
    <a href="#" class="feature-img">
      <div class="f-img-content">
        <h2>Lorem Ipsum project title</h2>
        <span class="f-cta">View Project</span>
        <img src="https://i.imgur.com/EENJU66.gif">
      </div>
    </a>
  </li>
  <li>
    <a href="#" class="feature-img">
      <img src="https://i.imgur.com/EENJU66.gif">
    </a>
  </li>
  <li>
    <a href="#" class="feature-img">
      <img src="https://i.imgur.com/EENJU66.gif">
    </a>
  </li>
  <li>
    <a href="#" class="feature-img">
      <img src="https://i.imgur.com/EENJU66.gif">
    </a>
  </li>
</ul>

为什么我的不透明度声明会影响其他元素？

2 个答案: