单击显示叠加层的 HTML 按钮

Question

我试图在单击按钮时显示整页的叠加层。我打算在内容 div 中添加一个 iframe 以进行弹出。这是我的 HTML：

和 CSS 来显示和隐藏叠加层：

.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，样式有一个小问题。向下滚动时，叠加层不会覆盖下面的部分。它只覆盖了开始向下滚动之前的部分。我试图将高度设置为 100%，但没有用。

任何想法如何解决这一问题？

谢谢！

Answer 1

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

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.box {\r\n  width: 20%;\r\n  margin: 0 auto;\r\n  background: rgba(255, 255, 255, 0.2);\r\n  padding: 35px;\r\n  border: 2px solid #fff;\r\n  border-radius: 20px/50px;\r\n  background-clip: padding-box;\r\n  text-align: center;\r\n}\r\n\r\n.button {\r\n  font-size: 1em;\r\n  padding: 10px;\r\n  color: #fff;\r\n  border: 2px solid blue;\r\n  border-radius: 20px/50px;\r\n  text-decoration: none;\r\n  cursor: pointer;\r\n  transition: all 0.3s ease-out;\r\n}\r\n\r\n.button:hover {\r\n  background: blue;\r\n}\r\n\r\n.overlay {\r\n  position: fixed;\r\n  top: 0;\r\n  bottom: 0;\r\n  left: 0;\r\n  right: 0;\r\n  background: rgba(0, 0, 0, 0.7);\r\n  transition: opacity 500ms;\r\n  visibility: hidden;\r\n  opacity: 0;\r\n}\r\n\r\n.overlay:target {\r\n  visibility: visible;\r\n  opacity: 1;\r\n}\r\n\r\n.popup {\r\n  margin: 70px auto;\r\n  padding: 20px;\r\n  background: #fff;\r\n  border-radius: 5px;\r\n  width: 30%;\r\n  position: relative;\r\n  transition: all 5s ease-in-out;\r\n}\r\n\r\n.popup h2 {\r\n  margin-top: 0;\r\n  color: #333;\r\n  font-family: Tahoma, Arial, sans-serif;\r\n}\r\n\r\n.popup .close {\r\n  position: absolute;\r\n  top: 20px;\r\n  right: 30px;\r\n  transition: all 200ms;\r\n  font-size: 30px;\r\n  font-weight: bold;\r\n  text-decoration: none;\r\n  color: #333;\r\n}\r\n\r\n.popup .close:hover {\r\n  color: orange;\r\n}\r\n\r\n.popup .content {\r\n  max-height: 30%;\r\n  overflow: auto;\r\n}

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<div style="height: 1200px;">\r\n\r\n\r\n  <div class="box">\r\n    <a class="button" href="#popup1">Show Overlay</a>\r\n  </div>\r\n\r\n  <div id="popup1" class="overlay">\r\n    <div class="popup">\r\n      <h2>Title</h2>\r\n      <a class="close" href="#">\xc3\x97</a>\r\n      <div class="content">\r\n        Content\r\n      </div>\r\n    </div>\r\n  </div>\r\n\r\n</div>

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