我一直在玩一些 CSS3 投影效果。我非常喜欢“抬 Angular ”效果,但在尝试向元素添加不透明度时遇到了问题。我的问题是:有没有办法在具有不透明度的元素上创建“抬 Angular ”效果?
.drop-shadow{
position:relative;
float:left;
width:40%;
padding:1em;
margin:2em 10px 4em;
background:#fff;
-webkit-box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
-moz-box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
}
.drop-shadow:before,
.drop-shadow:after{
content:"";
position:absolute;
z-index:-2;
}
.lifted{
-moz-border-radius:4px;
border-radius:4px;
}
.lifted:before,
.lifted:after{
bottom:15px;
left:10px;
width:50%;
height:20%;
max-width:300px;
max-height:100px;
-webkit-box-shadow:0 15px 10px rgba(0, 0, 0, 0.7);
-moz-box-shadow:0 15px 10px rgba(0, 0, 0, 0.7);
box-shadow:0 15px 10px rgba(0, 0, 0, 0.7);
-webkit-transform:rotate(-3deg);
-moz-transform:rotate(-3deg);
-ms-transform:rotate(-3deg);
-o-transform:rotate(-3deg);
transform:rotate(-3deg);
}
.lifted:after{
right:10px;
left:auto;
-webkit-transform:rotate(3deg);
-moz-transform:rotate(3deg);
-ms-transform:rotate(3deg);
-o-transform:rotate(3deg);
transform:rotate(3deg);
}
最佳答案
问题是理解stacking contexts以及它们在浏览器中的呈现方式。
- the root element (HTML),
- positioned (absolutely or relatively) with a z-index value other than "auto",
- elements with an opacity value less than 1.
- on mobile WebKit and Chrome 22+, position: fixed always creates a new stacking context, even when z-index is "auto"
9.9.1 Specifying the stack level: the 'z-index' property
- the background and borders of the element forming the stacking context.
- the child stacking contexts with negative stack levels (most negative first).
- the in-flow, non-inline-level, non-positioned descendants.
- the non-positioned floats.
- the in-flow, inline-level, non-positioned descendants, including inline tables and inline blocks.
- the child stacking contexts with stack level 0 and the positioned descendants with stack level 0.
- the child stacking contexts with positive stack levels (least positive first).
#test
的背景首先被渲染,因为这是应用了不透明度的元素。之后,阴影位于顶部,因为它们处于新的堆叠上下文中(position: absolute
)。最后,div 的文本。
一个简单的解决方案:将 div 包裹在另一个 div 中并将不透明度应用于 that div 而不是 #test
。
关于opacity - CSS3 "Lifted Corners"带不透明度的投影,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16067109/