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HTML

              
                
.button Hover me

.bg-1
.bg-2

              
            
!

CSS

              
                
body
  background-color: #000

.button
  display: inline-block
  position: fixed
  top: 50%
  left: 50%
  z-index: 2
  border: 2px solid rgba(#fff, 0.6)
  padding: 20px 32px
  transform: translate(-50%, -50%)
  font-family: sans-serif
  text-transform: uppercase
  color: rgba(#fff, 0.8)
  cursor: pointer
  transition: border-color 0.5s, background-color 0.5s, color 0.5s

  &:hover
    background-color: #fff
    border-color: transparent
    color: #444

    ~ .bg-1
      opacity: 0

    ~ .bg-2
      // To darken the picture I'm using only 70% opacity and
      // a black background color
      opacity: 0.7

$bg
  position: fixed
  top: 0
  left: 0
  z-index: 1
  width: 100%
  height: 100%
  background-repeat: no-repeat
  background-position: center center
  transition: opacity 1s

.bg-1
  @extends $bg
  background-image: url('//lorempixel.com/g/1920/1200/nature/5/')
  opacity: 0.6

.bg-2
  @extends $bg
  background-image: url('//lorempixel.com/g/1920/1200/animals/3/')
  opacity: 0

              
            
!

JS

              
                /*

  Unfortunately, this method is somewhat impractical as you
  have to place background elements after the button and set
  a smaller z-index which requires absolute/fixed positioning.
  Still, not that big of a deal with only a few elements
  and it looks cool.

  ---

  Changelog:

  4/10/2016
  * Figured out I wasn't that bright while writing
    the original code
  * Cleaned and improved the code
  * Changed Slim to Jade and Sass to Stylus - not because
    they're better or anything, I just wanted to
  * Spent a few minutes to come up with some clever changelog
    message

  12/9/2014
  * Made some miscellaneous improvements
  * Cleaned the code even, even more

  9/20/2014
  * Improved fallback for larger resolutions
  * Cleaned the code even more

  9/17/2014
  * Translated HTML to Slim and CSS to Sass for easier
    editing
  * Made some small fixes and removed headers
  * Fixed the images again

  6/7/2014
  * Fixed the images

*/
              
            
!
999px

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