/* 

============ PARALLAX ============

.parallax-container {
  position: relative;
  overflow: hidden;
  height: 60vh;
}

.parallax-container .parallax {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -1;
}

.parallax-container .parallax img {
  opacity: 0;
  position: absolute;
  left: 50%;
  bottom: 0;
  min-width: 100%;
  min-height: 100%;
  transform: translate3d(0, 0, 0);
  transform: translateX(-50%);
}

main {
  overflow: hidden;
}

============ HTML ============

<div class="parallax-container">
  <div class="parallax"><img src="img/imagen.jpg"></div>
</div>

*/

/**************************************/
/************** CUSTOM ****************/
/**************************************/