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HTML

              
                <button class="button">
  Wow! Such :hover!
</button>
              
            
!

CSS

              
                /** Created by Dave Lunny in the beautiful year 2015
  *   himynameisdave.com | @dave_lunny
  */

// Just some global resets nothing to see here...
* { box-sizing: border-box; font-family: "Roboto", Helvetica, Arial, sans-serif; text-align: center; &:focus { outline: none; } }
html, body { height: 100%; margin: 0; padding: 0; }


//  The gradient animation mixin
//  The most up to date version can be found here:
//  https://gist.github.com/himynameisdave/32e51f5ff4780ae2104d
.gradient-animation( @start, @end, @transTime ){
  background-size: 100%;
  background-image: -webkit-linear-gradient(@start, @end);
  background-image: linear-gradient(@start, @end);
  position: relative;
  z-index: 100;
  &:before {
    border-radius: inherit;
    background-image: -webkit-linear-gradient(@end, @start);
    background-image: linear-gradient(@end, @start);
    content: '';    
    display: block;
    height: 100%;
    width: 100%;
    position: absolute;
    top: 0; left: 0;
    opacity: 0;
    z-index: -100;
    -moz-transition: opacity @transTime ease-in-out;
    -webkit-transition: opacity @transTime ease-in-out;
    transition: opacity @transTime ease-in-out;
  }
  &:hover {
     &:before {
       opacity: 1; 
     }
  }
}

//  actual style of my element. This may be a bit different for you
.button {
  .gradient-animation( #fff, #ccc, 0.45s );// gradient animation mixin usage
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  border-radius: 0.45rem;
  border: 1px solid #ddd;
  cursor: pointer;
  color: #333;
  display: inline-block;
  font-size: 1rem;
  font-weight: 300;
  padding: 0.725rem 0.975rem;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  &:active { // not part of the mixin, I just wanted to add for dramatic effect
     &:before {
       opacity: 0; 
     }
  }
  @media all and (min-width: 480px){
    font-size: 1.25rem;
    padding: 1rem 1.5rem;
  }
}

// Now I'm going to try applying it to the body element
body {
  .gradient-animation( #F9D423, #FF4E50, 2.75s );  
  // Thanks to this service for the gradient color choice:
  // http://uigradients.com/#DanceToForget
}

              
            
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JS

              
                
              
            
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