如何在元素的一侧添加框阴影？

发布于 2024-10-19 02:26:48 字数 391 浏览 7 评论 0原文

我需要在某些 block 元素上创建一个框阴影，但仅（例如）在其右侧。我这样做的方法是将带有 box-shadow 的内部元素包装到带有 padding-right 和 overflow:hidden; 的外部元素中，这样阴影的其他三个侧面不可见。

有没有更好的方法来实现这一目标？喜欢 box-shadow-right 吗？

编辑：我的目的是仅创建阴影的垂直部分。与规则 background:url(shadow.png) 100% 0% Repeat-y 的 repeat-y 的作用完全相同。

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街道布景 2024-10-26 02:26:48

是的，您可以使用 box-shadow 规则的shadow spread属性：

.myDiv
{
  border: 1px solid #333;
  width: 100px;
  height: 100px;
  box-shadow: 10px 0 5px -2px #888;
}

<div class="myDiv"></div>

第四个属性-2px是阴影扩散，你可以用它来改变阴影的扩散，使阴影看起来只在一侧。

这也使用阴影定位规则 10px 将其发送到右侧（水平偏移），而 0px 将其保留在元素下方（垂直偏移）。

5px 是模糊半径:)

这里为您提供示例。

Yes, you can use the shadow spread property of the box-shadow rule:

.myDiv
{
  border: 1px solid #333;
  width: 100px;
  height: 100px;
  box-shadow: 10px 0 5px -2px #888;
}

<div class="myDiv"></div>

The fourth property there -2px is the shadow spread, you can use it to change the spread of the shadow, making it appear that the shadow is on one side only.

This also uses the shadow positioning rules 10px sends it to the right (horizontal offset) and 0px keeps it under the element (vertical offset.)

5px is the blur radius :)

Example for you here.

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君勿笑 2024-10-26 02:26:48

clip-path 现在（2020 年）是在元素的特定侧面实现框阴影的最简单方法之一，特别是当所需效果是在特定边缘处“干净剪切”阴影时（我相信这就是OP最初想要的），如下所示：

.shadow-element {
    border: 1px solid #333;
    width: 100px;
    height: 100px;
    box-shadow: 0 0 15px rgba(0,0,0,0.75);
    clip-path: inset(0 -15px 0 0);
}

<div class="shadow-element"></div>

...与这样的衰减/减少/细化阴影相反：

.shadow-element {
    border: 1px solid #333;
    width: 100px;
    height: 100px;
    box-shadow: 15px 0 15px -10px rgba(0,0,0,0.75);
}

<div class="shadow-element"></div>

只需将以下 CSS 应用于相关元素：

box-shadow: 0 0 Xpx [hex/rgba]; /* note 0 offset values */
clip-path: inset(Tpx Rpx Bpx Lpx);

其中：

的阴影可见性
Tpx 设置顶部边缘Rpx 右侧
Bpx 底部
Lpx left

对于应隐藏阴影的任何边缘输入值 0，对于应隐藏阴影的任何边缘输入负值（与框阴影模糊半径 - Xpx 相同）应该显示。

clip-path is now (2020) one of simplest ways to achieve box-shadows on specific sides of elements, especially when the required effect is a "clean cut" shadow at particular edges (which I believe was what the OP was originally looking for), like this:

.shadow-element {
    border: 1px solid #333;
    width: 100px;
    height: 100px;
    box-shadow: 0 0 15px rgba(0,0,0,0.75);
    clip-path: inset(0 -15px 0 0);
}

<div class="shadow-element"></div>

...as opposed to an attenuated/reduced/thinning shadow like this:

.shadow-element {
    border: 1px solid #333;
    width: 100px;
    height: 100px;
    box-shadow: 15px 0 15px -10px rgba(0,0,0,0.75);
}

<div class="shadow-element"></div>

Simply apply the following CSS to the element in question:

box-shadow: 0 0 Xpx [hex/rgba]; /* note 0 offset values */
clip-path: inset(Tpx Rpx Bpx Lpx);

Where:

Tpx sets the shadow visibility for the top edge
Rpx right
Bpx bottom
Lpx left

Enter a value of 0 for any edges where the shadow should be hidden and a negative value (the same as the box-shadow blur radius - Xpx) to any edges where the shadow should be displayed.

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枯寂 2024-10-26 02:26:48

我自制的解决方案很容易编辑：

HTML:

<div id="anti-shadow-div">
    <div id="shadow-div"></div>
</div>

css:

#shadow-div{
    margin-right:20px; /* Set to 0 if you don't want shadow at the right side */
    margin-left:0px; /* Set to 20px if you want shadow at the left side */
    margin-top:0px; /* Set to 20px if you want shadow at the top side */
    margin-bottom:0px; /* Set to 20px if you want shadow at the bottom side */
    box-shadow: 0px 0px 20px black; 
    height:100px;
    width:100px;
    background: red;
}

#anti-shadow-div{
    margin:20px;
    display:table;
    overflow:hidden;
}

Demo:
http://jsfiddle.net/jDyQt/103

My self-made solution which is easy to edit:

HTML:

<div id="anti-shadow-div">
    <div id="shadow-div"></div>
</div>

css:

#shadow-div{
    margin-right:20px; /* Set to 0 if you don't want shadow at the right side */
    margin-left:0px; /* Set to 20px if you want shadow at the left side */
    margin-top:0px; /* Set to 20px if you want shadow at the top side */
    margin-bottom:0px; /* Set to 20px if you want shadow at the bottom side */
    box-shadow: 0px 0px 20px black; 
    height:100px;
    width:100px;
    background: red;
}

#anti-shadow-div{
    margin:20px;
    display:table;
    overflow:hidden;
}

Demo:
http://jsfiddle.net/jDyQt/103

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烛影斜 2024-10-26 02:26:48

要获得最多两侧的剪切效果，您可以使用具有背景渐变的伪元素。

header::before, main::before, footer::before, header::after, main::after, footer::after {
    display:    block;
    content:    '';
    position:   absolute;
    width:      8px;
    height:     100%;
    top:        0px;
}

header::before, main::before, footer::before {
    left:       -8px;
    background: linear-gradient(to left, rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0));
}

header::after, main::after, footer::after {
    right:      -8px;
    background: linear-gradient(to right, rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0));
}

将为通常构成文档的元素的左侧和右侧添加漂亮的类似阴影的效果。

To get the clipped effect on up to two sides you can use pseudo elements with background gradients.

header::before, main::before, footer::before, header::after, main::after, footer::after {
    display:    block;
    content:    '';
    position:   absolute;
    width:      8px;
    height:     100%;
    top:        0px;
}

header::before, main::before, footer::before {
    left:       -8px;
    background: linear-gradient(to left, rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0));
}

header::after, main::after, footer::after {
    right:      -8px;
    background: linear-gradient(to right, rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0));
}

will add a nice shadow-like effect to the left and right of the elements that normally make up a document.

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寄居人 2024-10-26 02:26:48

只需使用 ::after 或 ::before 伪元素即可添加阴影。将其设置为 1px 并将其放置在您想要的任何一侧。下面是顶部的示例。

footer {
   margin-top: 50px;
   color: #fff;
   background-color: #009eff;
   text-align: center;
   line-height: 90px;
   position: relative;
}

footer::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 1px;
    top: 0;
    left: 0;
    z-index: -1;
    box-shadow: 0px 0px 10px 1px rgba(0, 0, 0, 0.75);
}

<footer>top only box shadow</footer>

Just use ::after or ::before pseudo element to add the shadow. Make it 1px and position it on whatever side you want. Below is example of top.

footer {
   margin-top: 50px;
   color: #fff;
   background-color: #009eff;
   text-align: center;
   line-height: 90px;
   position: relative;
}

footer::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 1px;
    top: 0;
    left: 0;
    z-index: -1;
    box-shadow: 0px 0px 10px 1px rgba(0, 0, 0, 0.75);
}

<footer>top only box shadow</footer>

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人疚 2024-10-26 02:26:48

这是我的例子：

.box{
        
        width: 400px; 
        height: 80px; 
        background-color: #C9C; 
        text-align: center; 
        font: 20px normal Arial, Helvetica, sans-serif; 
        color: #fff; 
        padding: 100px 0 0 0;
        -webkit-box-shadow: 0 8px 6px -6px black;
           -moz-box-shadow: 0 8px 6px -6px black;
                box-shadow: 0 8px 6px -6px black;
    }

<div class="box">
</div>

Here is my example:

.box{
        
        width: 400px; 
        height: 80px; 
        background-color: #C9C; 
        text-align: center; 
        font: 20px normal Arial, Helvetica, sans-serif; 
        color: #fff; 
        padding: 100px 0 0 0;
        -webkit-box-shadow: 0 8px 6px -6px black;
           -moz-box-shadow: 0 8px 6px -6px black;
                box-shadow: 0 8px 6px -6px black;
    }

<div class="box">
</div>

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往事随风而去 2024-10-26 02:26:48

这是一个 codepen 来演示每一方，或者一个工作片段：

.boxes {
  display: flex;
  flex-wrap: wrap;
}

.box {
  margin: 20px;
  border: 1px solid #ccc;
  font-family: Helvetica Neue, Arial, sans-serif;
  font-weight: 100;
  letter-spacing: 2px;
  color: #999;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  flex: 1;
  padding: 40px;
  line-height: 1.4em;
}

.top {
  box-shadow: 0 -5px 5px -5px #333;
}

.right {
  box-shadow: 5px 0 5px -5px #333;
}

.bottom {
  box-shadow: 0 5px 5px -5px #333;
}

.left {
  box-shadow: -5px 0 5px -5px #333;
}

<div class="boxes">
  <div class="box top">Top Only</div>
  <div class="box right">Right Only</div>
  <div class="box bottom">Bottom Only</div>
  <div class="box left">Left Only</div>
</div>

Here is a codepen to demonstrate for each side, or a working snippet:

.boxes {
  display: flex;
  flex-wrap: wrap;
}

.box {
  margin: 20px;
  border: 1px solid #ccc;
  font-family: Helvetica Neue, Arial, sans-serif;
  font-weight: 100;
  letter-spacing: 2px;
  color: #999;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  flex: 1;
  padding: 40px;
  line-height: 1.4em;
}

.top {
  box-shadow: 0 -5px 5px -5px #333;
}

.right {
  box-shadow: 5px 0 5px -5px #333;
}

.bottom {
  box-shadow: 0 5px 5px -5px #333;
}

.left {
  box-shadow: -5px 0 5px -5px #333;
}

<div class="boxes">
  <div class="box top">Top Only</div>
  <div class="box right">Right Only</div>
  <div class="box bottom">Bottom Only</div>
  <div class="box left">Left Only</div>
</div>

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纵山崖 2024-10-26 02:26:48

这是我做的一个小技巧。

<div id="element"><!--element that I want an one-sided inset shadow from the bottom--></div> 
<div class="one_side_shadow"></div>

1. 在我想要创建单侧框阴影的元素正下方创建一个

（在在这种情况下，我想要一个来自底部的 id="element" 的单侧插入阴影）

2. 然后我创建了一个常规的 box-shadow 使用负垂直偏移将阴影向上推到一侧。

`box-shadow: 0 -8px 20px 2px #DEDEE3;`

Here's a little hack that I did.

<div id="element"><!--element that I want an one-sided inset shadow from the bottom--></div> 
<div class="one_side_shadow"></div>

1. Create a <div class="one_side_shadow"></div> right below the element that I want to create the one-side box shadow (in this case I want a one-sided inset shadow for id="element" coming from the bottom)

2. Then I created a regular box-shadow using a negative vertical offset to push the shadow upwards to one-side.

`box-shadow: 0 -8px 20px 2px #DEDEE3;`

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牵你手 2024-10-26 02:26:48

这可能是一种简单的方法

border-right : 1px solid #ddd;
height:85px;    
box-shadow : 10px 0px 5px 1px #eaeaea;

将其分配给任何 div

This could be a simple way

border-right : 1px solid #ddd;
height:85px;    
box-shadow : 10px 0px 5px 1px #eaeaea;

Assign this to any div

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两相知 2024-10-26 02:26:48

这个网站帮助了我：https://gist.github.com/ocean90/1268328（请注意在该网站上，截至本文发布之日，左侧和右侧已颠倒……但它们按预期工作）。 它们在下面的代码中得到纠正。

<!DOCTYPE html>
<html>
    <head>
        <title>Box Shadow</title>

        <style>
            .box {
                height: 150px;
                width: 300px;
                margin: 20px;
                border: 1px solid #ccc;
            }

            .top {
                box-shadow: 0 -5px 5px -5px #333;
            }

            .right {
                box-shadow: 5px 0 5px -5px #333;
            }

            .bottom {
                box-shadow: 0 5px 5px -5px #333;
            }

            .left {
                box-shadow: -5px 0 5px -5px #333;
            }

            .all {
                box-shadow: 0 0 5px #333;
            }
        </style>
    </head>
    <body>
        <div class="box top"></div>
        <div class="box right"></div>
        <div class="box bottom"></div>
        <div class="box left"></div>
        <div class="box all"></div>
    </body>
</html>

This site helped me: https://gist.github.com/ocean90/1268328 (Note that on that site the left and right are reversed as of the date of this post... but they work as expected). They are corrected in the code below.

<!DOCTYPE html>
<html>
    <head>
        <title>Box Shadow</title>

        <style>
            .box {
                height: 150px;
                width: 300px;
                margin: 20px;
                border: 1px solid #ccc;
            }

            .top {
                box-shadow: 0 -5px 5px -5px #333;
            }

            .right {
                box-shadow: 5px 0 5px -5px #333;
            }

            .bottom {
                box-shadow: 0 5px 5px -5px #333;
            }

            .left {
                box-shadow: -5px 0 5px -5px #333;
            }

            .all {
                box-shadow: 0 0 5px #333;
            }
        </style>
    </head>
    <body>
        <div class="box top"></div>
        <div class="box right"></div>
        <div class="box bottom"></div>
        <div class="box left"></div>
        <div class="box all"></div>
    </body>
</html>

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北风几吹夏 2024-10-26 02:26:48

div {
 border: 1px solid #666;
    width: 50px;
    height: 50px;
    -webkit-box-shadow: inset 10px 0px 5px -1px #888 ;
}

div {
 border: 1px solid #666;
    width: 50px;
    height: 50px;
    -webkit-box-shadow: inset 10px 0px 5px -1px #888 ;
}

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情栀口红 2024-10-26 02:26:48

我所做的是为阴影创建一个垂直块，并将其放置在我的块元素应该所在的位置旁边。然后，这两个块被包装到另一个块中：

<div id="wrapper">
    <div id="shadow"></div>  
    <div id="content">CONTENT</div>  
</div>

<style>

div#wrapper {
  width:200px;
  height:258px;      
}

div#wrapper > div#shadow {
  display:inline-block;
  width:1px;
  height:100%;
  box-shadow: -3px 0px 5px 0px rgba(0,0,0,0.8)
}

div#wrapper > div#content {
  display:inline-block;
  height:100%;
  vertical-align:top;
}

</style>

jsFiddle 示例此处。

What I do is create a vertical block for the shadow, and place it next to where my block element should be. The two blocks are then wrapped into another block:

<div id="wrapper">
    <div id="shadow"></div>  
    <div id="content">CONTENT</div>  
</div>

<style>

div#wrapper {
  width:200px;
  height:258px;      
}

div#wrapper > div#shadow {
  display:inline-block;
  width:1px;
  height:100%;
  box-shadow: -3px 0px 5px 0px rgba(0,0,0,0.8)
}

div#wrapper > div#content {
  display:inline-block;
  height:100%;
  vertical-align:top;
}

</style>

jsFiddle example here.

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九厘米的零° 2024-10-26 02:26:48

好的，这是再试一次。使用伪元素并在其上应用阴影盒属性。

html:

<div class="no-relevant-box">
  <div class="div-to-shadow-1"></div>
  <div class="div-to-shadow-2"></div>
</div>

sass:

.div-to-shadow-1, .div-to-shadow-2
  height: 150px
  width: 150px
  overflow: hidden
  transition: all 0.3s ease-in-out
  &::after
    display: block
    content: ''
    position: relative
    top: 0
    left: 100%
    height: 100%
    width: 10px
    border: 1px solid mediumeagreen
    box-shadow:  0px 7px 12px rgba(0,0,0,0.3)
  &:hover
    border: 1px solid dodgerblue
    overflow: visible

https://codepen.io/alex3o0/pen/PrMyNQ

Ok, here is one try more. Using pseudo elements and aplying the shadow-box porperty over them.

html:

<div class="no-relevant-box">
  <div class="div-to-shadow-1"></div>
  <div class="div-to-shadow-2"></div>
</div>

sass:

.div-to-shadow-1, .div-to-shadow-2
  height: 150px
  width: 150px
  overflow: hidden
  transition: all 0.3s ease-in-out
  &::after
    display: block
    content: ''
    position: relative
    top: 0
    left: 100%
    height: 100%
    width: 10px
    border: 1px solid mediumeagreen
    box-shadow:  0px 7px 12px rgba(0,0,0,0.3)
  &:hover
    border: 1px solid dodgerblue
    overflow: visible

https://codepen.io/alex3o0/pen/PrMyNQ

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~没有更多了~