html - 带有CSS的透明模糊固定 block

Question

我正在尝试制作一个透明的固定 header 没有 JS 但只有 CSS。我有一个示例，其中使用 ::before 制作具有负 z-index 的模糊基板。

https://jsfiddle.net/VeryDeepSky/w8a93wpu/

但我刚刚失败了……很多次了……与此同时，我已经知道如何使用 jQuery 来做到这一点。我正在寻找 CSS 解决方案。有人可以帮忙吗？

谢谢!

附言这是我正在尝试做的事情。

https://jsfiddle.net/VeryDeepSky/81f7wcwh/6/

Answer 1

我找到了背景图片的解决方案，但我不知道如何对标题下的所有元素应用模糊效果。

.content:before {
  content: '';
  display: block;
  position: fixed;
  left: 0;
  right: 0;
  top: -5px;
  height: 100px;
  background-image: url('http://666a658c624a3c03a6b2-25cda059d975d2f318c03e90bcf17c40.r92.cf1.rackcdn.com/unsplash_527bf56961712_1.JPG');
  -webkit-filter: blur(5px);
  -moz-filter: blur(5px);
  -o-filter: blur(5px);
  -ms-filter: blur(5px);
  filter: blur(5px);
}
.content {
  background-image: url('http://666a658c624a3c03a6b2-25cda059d975d2f318c03e90bcf17c40.r92.cf1.rackcdn.com/unsplash_527bf56961712_1.JPG');
  background-attachment: fixed;
  left: 0;
  right: 0;
  width: 1200px;
  height: 800px;
}
p:first-child {
  padding-top: 100px;
}

<div class="content">
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis aliquam erat in ante malesuada, facilisis semper nulla semper. Phasellus sapien neque, faucibus in malesuada quis, lacinia et libero. Sed sed turpis tellus. Etiam ac aliquam tortor, eleifend
    rhoncus metus. Ut turpis massa, sollicitudin sit amet molestie a, posuere sit amet nisl. Mauris tincidunt cursus posuere. Nam commodo libero quis lacus sodales, nec feugiat ante posuere. Donec pulvinar auctor commodo. Donec egestas diam ut mi adipiscing,
    quis lacinia mauris condimentum. Quisque quis odio venenatis, venenatis nisi a, vehicula ipsum. Etiam at nisl eu felis vulputate porta.</p>
  <p>Fusce ut placerat eros. Aliquam consequat in augue sed convallis. Donec orci urna, tincidunt vel dui at, elementum semper dolor. Donec tincidunt risus sed magna dictum, quis luctus metus volutpat. Donec accumsan et nunc vulputate accumsan. Vestibulum
    tempor, erat in mattis fringilla, elit urna ornare nunc, vel pretium elit sem quis orci. Vivamus condimentum dictum tempor. Nam at est ante. Sed lobortis et lorem in sagittis. In suscipit in est et vehicula.</p>
</div>