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  @import url(https://fonts.googleapis.com/css?family=Roboto+Slab:400,300);

  // root html style
  :root {
  width: 100%;
  height: 100%; 
  transition: font-size 500ms cubic-bezier(0.680, -0.550, 0.265, 1.550);
  font-size: 100%;

    @media screen and (min-width: 50em) {
    font-size: 150%; }
    
    @media screen and (min-width: 80em) {
    font-size: 180%; }
  }

  // body style
  body {
  height: 100%;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #00BCD4;
  line-height: 1.5;
  animation: rainbow 25s infinite;
  user-select: none;
  font-family: "Roboto Slab", serif; }


  // link element
  a {
  color: #FFFFFF;
  position: relative;
  text-decoration: none;
  margin: 2rem;
  font-size: 3rem;
  flex-grow: 1;
  font-weight: 300;
  overflow: hidden;
  display: block;
  text-align: center;
  animation-duration: 1s;
  animation-fill-mode: both;
    
      // text element inside
      span {
      display: block;
      transition: transform 500ms cubic-bezier(0.680, -0.550, 0.265, 1.550); } 
      
      // slide text from data-link-title
      &:after {
      content: attr(data-link-alt);
      display: inline;
      position: absolute;
      transition: top 500ms cubic-bezier(0.680, -0.550, 0.265, 1.550);
      top: 100%;
      left: 0;
      right: 0;
      text-align: center; }
      
      // animation when hovered
      &:hover {
      cursor: grab;

        span {
        transform: translateY(-100%); }
        
        &:after {
        top: 0; }
      }
    
      &:active {
      animation-name: rubberBand;
      cursor: grabbing; }

  }





  // Background animation 
  @keyframes rainbow { 
    0% { background: #00BCD4; }
    25% { background: #00C853; }
    50% { background: #C62828; }
    75% { background: #4527A0; }
    100% { background: #00BCD4; }
  }


@keyframes rubberBand {
  0% {
    transform: scale3d(1, 1, 1);
  }

  30% {
    transform: scale3d(1.25, 0.75, 1);
  }

  40% {
    transform: scale3d(0.75, 1.25, 1);
  }

  50% {
    transform: scale3d(1.15, 0.85, 1);
  }

  65% {
    transform: scale3d(.95, 1.05, 1);
  }

  75% {
    transform: scale3d(1.05, .95, 1);
  }

  100% {
    transform: scale3d(1, 1, 1);
  }
}