单击显示叠加层的 HTML 按钮

Question

我试图在点击按钮时显示整个页面的叠加层。我打算在内容 div 中添加一个 iframe 以弹出。这是我的 HTML:

以及用于显示和隐藏叠加层的 CSS:

.box {
  width: 20%;
  margin: 0 auto;
  background: rgba(255,255,255,0.2);
  padding: 35px;
  border: 2px solid #fff;
  border-radius: 20px/50px;
  background-clip: padding-box;
  text-align: center;
}

.button {
  font-size: 1em;
  padding: 10px;
  color: #fff;
  border: 2px solid blue;
  border-radius: 20px/50px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease-out;
}
.button:hover {
  background: blue;
}

.overlay {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.7);
  transition: opacity 500ms;
  visibility: hidden;
  opacity: 0;
}
.overlay:target {
  visibility: visible;
  opacity: 1;
}

.popup {
  margin: 70px auto;
  padding: 20px;
  background: #fff;
  border-radius: 5px;
  width: 30%;
  position: relative;
  transition: all 5s ease-in-out;
}

.popup h2 {
  margin-top: 0;
  color: #333;
  font-family: Tahoma, Arial, sans-serif;
}
.popup .close {
  position: absolute;
  top: 20px;
  right: 30px;
  transition: all 200ms;
  font-size: 30px;
  font-weight: bold;
  text-decoration: none;
  color: #333;
}
.popup .close:hover {
  color: orange;
}
.popup .content {
  max-height: 30%;
  overflow: auto;
}

<div style="height: 1200px;">


<div class="box">
	<a class="button" href="#popup1">Show Overlay</a>
</div>

<div id="popup1" class="overlay">
	<div class="popup">
		<h2>Title</h2>
		<a class="close" href="#">×</a>
		<div class="content">
			Content
		</div>
	</div>
</div>

</div>

我的 jsfiddle

但是，样式存在一个小问题。向下滚动时，叠加层不会覆盖下面的部分。它只覆盖开始向下滚动之前的部分。我尝试将高度设置为 100%，但没有成功。

有什么办法解决这个问题吗？

谢谢!

Answer 1

使用 position: fixed; 而不是 position: absolute;。 position absolute 根据窗口高度而非主体设置自动高度。

.box {
  width: 20%;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.2);
  padding: 35px;
  border: 2px solid #fff;
  border-radius: 20px/50px;
  background-clip: padding-box;
  text-align: center;
}

.button {
  font-size: 1em;
  padding: 10px;
  color: #fff;
  border: 2px solid blue;
  border-radius: 20px/50px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease-out;
}

.button:hover {
  background: blue;
}

.overlay {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.7);
  transition: opacity 500ms;
  visibility: hidden;
  opacity: 0;
}

.overlay:target {
  visibility: visible;
  opacity: 1;
}

.popup {
  margin: 70px auto;
  padding: 20px;
  background: #fff;
  border-radius: 5px;
  width: 30%;
  position: relative;
  transition: all 5s ease-in-out;
}

.popup h2 {
  margin-top: 0;
  color: #333;
  font-family: Tahoma, Arial, sans-serif;
}

.popup .close {
  position: absolute;
  top: 20px;
  right: 30px;
  transition: all 200ms;
  font-size: 30px;
  font-weight: bold;
  text-decoration: none;
  color: #333;
}

.popup .close:hover {
  color: orange;
}

.popup .content {
  max-height: 30%;
  overflow: auto;
}

<div style="height: 1200px;">


  <div class="box">
    <a class="button" href="#popup1">Show Overlay</a>
  </div>

  <div id="popup1" class="overlay">
    <div class="popup">
      <h2>Title</h2>
      <a class="close" href="#">×</a>
      <div class="content">
        Content
      </div>
    </div>
  </div>

</div>