为什么边框半径不能与边框图像渐变一起使用?

问题描述 投票:0回答:3

我有以下CSS:

a.btn.white-grad {
    background: $lgrey;
    color: #313149 !important;
    border: 1px solid #000;
    border-image-source: linear-gradient(to right, #9c20aa, #fb3570);
    border-image-slice: 20;
    float: left;
    @include font-size(26);
    margin: 75px 0;
}

添加

border-radius: 5px
似乎没有任何作用。我想这是因为我使用了边框渐变...有没有办法让我达到所需的 5px 边框半径?

css border linear-gradients
3个回答
121
投票

2021:如果你想要透明度,我建议使用CSS mask方法,因为现在支持得很好


您不能将

border-radius
与渐变一起使用。这是另一个想法,您可以依靠多个背景并调整
background-clip
:

.white-grad {
  background: 
    linear-gradient(#ccc 0 0) padding-box, /*this is your grey background*/
    linear-gradient(to right, #9c20aa, #fb3570) border-box;
  color: #313149;
  padding: 10px;
  border: 5px solid transparent;
  border-radius: 15px;
  display: inline-block;
  margin: 75px 0;
}
<div class="white-grad"> Some text here</div>

<div class="white-grad"> Some long long long text here</div>

<div class="white-grad"> Some long long <br>long text here</div>

SVG方法

如果你想要透明度,你可以考虑SVG,如下所示:

svg {
  width:200px;
  height:100px;
  margin:10px;
}
<svg xmlns="http://www.w3.org/2000/svg">
<defs>
      <linearGradient id="Gradient" x1="0" x2="100" y1="0" y2="0" gradientUnits="userSpaceOnUse">
         <stop stop-color="#9c20aa" offset="0"/>
         <stop stop-color="#fb3570" offset="1"/>
      </linearGradient>
   </defs>
  <rect x="5" y="5" height="100%" width="100%" style="width:calc(100% - 10px);height:calc(100% - 10px)" rx="20" ry="20" stroke-width="10" fill="transparent" stroke="url(#Gradient)"/>
</svg>

您可以申请作为背景:

.white-grad {
    background:url('data:image/svg+xml;utf8,<svg   xmlns="http://www.w3.org/2000/svg" ><defs><linearGradient id="Gradient" x1="0" x2="100" y1="0" y2="0" gradientUnits="userSpaceOnUse"><stop stop-color="%239c20aa" offset="0"/><stop stop-color="%23fb3570" offset="1"/></linearGradient></defs><rect x="5" y="5" width="100%" height="100%" style="height:calc(100% - 10px);width:calc(100% - 10px)" rx="20" ry="20" stroke-width="10" fill="transparent" stroke="url(%23Gradient)"/></svg>');
    color: #313149;
    padding:25px;
    border-radius:15px;
    display:inline-block;
    margin: 75px 0;
}

body {
  background:yellow;
}
<div class="white-grad"> Some text here</div>

<div class="white-grad"> text very loooooooooooong here</div>

mask
相同,您可以在 SVG 之外获取渐变:

.white-grad {
  color: #313149;
  padding: 25px;
  border-radius: 15px;
  display: inline-block;
  margin: 75px 0;
  background-size: 0 0;
  position: relative;
  z-index: 0;
}

.white-grad::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: inherit;
  background-size: auto;
  --mask: url('data:image/svg+xml;utf8,<svg  xmlns="http://www.w3.org/2000/svg" ><rect x="5" y="5" width="100%" height="100%" style="height:calc(100% - 10px);width:calc(100% - 10px)" rx="20" ry="20" stroke-width="10" fill="transparent" stroke="white"/></svg>');
  -webkit-mask: var(--mask);
          mask: var(--mask);
}

body {
  background: yellow;
}
<div class="white-grad" style="background-image:linear-gradient(to right,blue,red)"> Some text here</div>

<div class="white-grad" style="background-image:linear-gradient(black,lightblue,green)"> text very loooooooooooong here</div>

<div class="white-grad" style="background-image:radial-gradient(blue,pink)"> text very<br> loooooooooooong here</div>


您还可以将其用作常用元素,并考虑

position:absolute
将其放置在文本周围:

.white-grad {
  color: #313149;
  padding: 25px;
  border-radius: 15px;
  display: inline-block;
  margin: 75px 0;
  position:relative;
  z-index:0;
}
.white-grad > svg {
  position:absolute;
  top:0;
  left:0;
  height:100%;
  width:100%;
  z-index:-1;
}

body {
  background: yellow;
}

.hide {
 height:0;
 width:0;
}
<svg class="hide" xmlns="http://www.w3.org/2000/svg"><defs><linearGradient id="Gradient" x1="0" x2="100" y1="0" y2="0" gradientUnits="userSpaceOnUse"><stop stop-color="#9c20aa" offset="0"/><stop stop-color="#fb3570" offset="1"/></linearGradient></defs><rect x="5" y="5" width="100%" height="100%" id="border" style="height:calc(100% - 10px);width:calc(100% - 10px)" rx="20" ry="20" stroke-width="10" fill="transparent" stroke="url(#Gradient)"/></svg>


<div class="white-grad"> 
<svg xmlns="http://www.w3.org/2000/svg">
  <use href="#border" />
</svg>
Some text here</div>

<div class="white-grad"> 
<svg xmlns="http://www.w3.org/2000/svg">
  <use href="#border" />
</svg>
text very loooooooooooong here</div>


CSS遮罩方法

这里有一个不同的 CSS 想法,使用

mask
,你将获得透明度,并且它也会响应:

.white-grad {
  color: #313149;
  padding: 10px;
  display: inline-block;
  margin: 75px 0;
  position: relative;
  z-index: 0;
}
.white-grad:before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  padding: 5px;
  border-radius: 15px;
  background: linear-gradient(to right, #9c20aa, #fb3570);
  -webkit-mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
          mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;

}
<div class="white-grad"> Some text here</div>

<div class="white-grad"> Some long long long text here</div>

<div class="white-grad"> Some long long <br>long text here</div>

通过 CSS 变量,我们可以轻松调整:

.white-grad {
  --b:5px;  /* border width*/
  --r:15px; /* the radius */

  color: #313149;
  padding: calc(var(--b) + 5px);
  display: inline-block;
  margin: 75px 0;
  position:relative;
  z-index:0;
}
.white-grad:before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  padding: var(--b);
  border-radius: var(--r);
  background: var(--c,linear-gradient(to right, #9c20aa, #fb3570)); 
  -webkit-mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
          mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
}

body {
  background:#f2f2f2;
}
<div class="white-grad"> Some text here</div>

<div class="white-grad" style="--r:20px;--b:10px;--c:linear-gradient(140deg,red,yellow,green)"> Some long long long text here</div>

<div class="white-grad"  style="--r:30px;--b:8px;--c:linear-gradient(-40deg,black 50%,blue 0)"> Some long long <br>long text here</div>

<div class="white-grad"  style="--r:40px;--b:20px;--c:conic-gradient(black,orange,purple)"> Some long long <br>long text here<br> more and more more and more</div>

获得不同效果的相关问题:如何在 CSS 中应用从外到内的渐变,仅应用于边框?


以上示例还涵盖了圆形:

.white-grad {
  --b:5px;  /* border width*/

  color: #313149;
  display: inline-block;
  margin: 10px;
  width: 150px;
  aspect-ratio: 1;
  position: relative;
  z-index: 0;
}

.white-grad:before {
  content:"";
  position:absolute;
  z-index:-1;
  inset: 0;
  background: var(--c,linear-gradient(to right, #9c20aa, #fb3570));
  padding: var(--b);
  border-radius: 50%;
  -webkit-mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
          mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
}

body {
  background:#f2f2f2;
}
<div class="white-grad"></div>

<div class="white-grad" style="--b:10px;--c:linear-gradient(140deg,red,yellow,green)"></div>

<div class="white-grad"  style="--b:8px;--c:linear-gradient(-40deg,black 50%,blue 0)"></div>

<div class="white-grad"  style="--b:20px;--c:conic-gradient(black,orange,purple)"></div>

如果您想对边框应用动画,相关问题:具有透明背景和旋转渐变边框的按钮


还有不同的半径形状:

.white-grad {
  --b:5px;  /* border width*/

  color: #313149;
  display: inline-block;
  margin: 10px;
  width: 150px;
  aspect-ratio: 1;
  position: relative;
  z-index: 0;
}

.white-grad:before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  background: var(--c,linear-gradient(to right, #9c20aa, #fb3570));
  padding: var(--b);
  border-radius: var(--r,50%);
  -webkit-mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
         mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
}

body {
  background:#f2f2f2;
}
<div class="white-grad" style="--r:50% 0 50% 50%;"></div>

<div class="white-grad" style="--b:10px;--r:50% 0;--c:linear-gradient(140deg,red,yellow,green)"></div>

<div class="white-grad"  style="--b:8px;--r:50% 0 0;--c:linear-gradient(-40deg,black 50%,blue 0)"></div>

<div class="white-grad"  style="--b:20px;--r:50% 50% 0 0;--c:conic-gradient(black,orange,purple)"></div>

以及不同的边框厚度:

.white-grad {
  --b:5px;  /* border width*/

  color: #313149;
  display: inline-block;
  margin: 10px;
  width: 150px;
  aspect-ratio: 1;
  position: relative;
  z-index: 0;
}
.white-grad:before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  background: var(--c,linear-gradient(#9c20aa, #fb3570));
  padding: var(--b);
  border-radius:var(--r,50%);
  -webkit-mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
          mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
}

body {
  background:#f2f2f2;
}
<div class="white-grad" style="--b:0 0 20px 20px;--r:50% 0 50% 50%;"></div>

<div class="white-grad" style="--b:10px 0 10px 0;--r:50% 0;--c:linear-gradient(140deg,red,yellow,green)"></div>

<div class="white-grad"  style="--b:8px 0px 0px 8px;--r:50% 0 0;--c:linear-gradient(40deg,black 50%,blue 0)"></div>

<div class="white-grad"  style="--b:20px 20px 0 20px;--r:50% 50% 0 0;--c:conic-gradient(pink,orange,red,pink)"></div>


2
投票

2023 - 单一元素,无伪元素,无 SVG,无遮罩。

这不能归咎于我,我在一个网站上看到了这个(我忘记了这个网站,再也找不到了)。

  • 这只是一个普通的
    button
    ,带有圆角边缘和渐变背景
  • 它使用了
    box-shadow
    inset
    来将内部填充为白色
  • 它有一个 2px 边框,实际上是透明的,因此按钮的边缘可以透过

body {
  background: aliceblue;
}

.gradient-border {  
  border-radius: 24px;
  padding: 6px 12px;
  background-image: linear-gradient(90deg, red 0%, blue 100%);
  /* Fill the inside with white */
  background-origin: border-box;
  box-shadow: inset 0 100vw white;
  /* A transparent border, so the very edge of the button shows through */
  border: 2px solid transparent;
}
<button class="gradient-border">Hello</button>


-1
投票

您需要将按钮包装在 div 中,并在该父 div 上设置

border-radius
。为了工作,您还必须将
overflow:hidden
设置为该父 div。像这样:

.btn-wrap {
    border-radius: 5px;
    overflow: hidden;
    margin: 20px;
    width: 60px;
}
a.btn.white-grad {
    background: #eee;
    color: #313149 !important;
    border: 20px solid #000;
    border-image-source: linear-gradient(to right, #9c20aa, #fb3570);
    border-image-slice: 20;
    line-height: 2;
}
	<div class="btn-wrap">
		<a href="#" class="btn white-grad">link</a>
	</div>

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