Using gradient on div border with rounded corners

Question

I have some divs that have rounded corners and colored borders. I want the borders of the div to have the gradient so that it will change when the user hovers overs the div.

I have found all of the sites on how to use the gradient (http://css-tricks.com/css3-gradients/, http://gradients.glrzad.com/, etc.) but I still can't figure out how to get this to work for rounded edge borders.

Will someone please guide me to a site that describes how to do this or even help me with the code?

Answer 1

Here is the SIMPLE solution for that :

Outcome : CSS rounded corners with gradient border

.yourClass {
  display: inline-flex;
  border: double 6px transparent;
  border-radius: 80px;
  background-image: linear-gradient(white, white), radial-gradient(circle at top left, #f00, #3020ff);
  background-origin: border-box;
  background-clip: content-box, border-box;
} 

Answer 2

You can nest two elements and let the outer div act as the gradient border then you can work around this problem, example:

<div class="container">
  <div class="content">
    ...
  </div>
</div> 

And then in your CSS:

/* 
   unprefixed for conciseness, use a gradient generator por production code 
*/

.container { 
   background: linear-gradient(red, black);
 }

.content   { 
   background: white; 
   padding: 10px;
 }

For a working example take a look at https://stackoverflow.com/a/7066176/524555

Answer 3

Using a :before element is the most ideal solution in my opinion, as you then have full control via CSS and the HTML markup stays clean.

.circle {
  width: 300px;
  height: 200px;
  background: white;
  border-radius: 100%;
  position: relative;
  text-align: center;
  padding: 20px;
  box-sizing: border-box;
}
.circle::before {
  border-radius: 100%;
  width: 100%;
  height:100%;
  content: '';
  background-image: linear-gradient(to bottom, #3acfd5 0%, #3a4ed5 100%);
  padding: 10px;
  top: -10px;
  left: -10px;
  position:absolute;
  z-index:-1;
}

You can tweak the padding and the top and left values to adjust the border thickness.

Here is a JSFiddle that shows a practival example: http://jsfiddle.net/wschwarz/e2ckdp2v/