.cards {
  position: relative;
  list-style-type: none;
  padding: 0;
  max-width: 34em;
  margin: 20% auto 0;
}
.card {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  background: #ccc;
  border-radius: 30px;
  padding: 40px;
  box-shadow: 0 0 40px #000;
  -webkit-transform: translateY(0) rotate(4deg) translateX(25px) scale(1);
          transform: translateY(0) rotate(4deg) translateX(25px) scale(1);
  -webkit-transform-origin: 0 0;
          transform-origin: 0 0;
  -webkit-transition: background 0.4s linear, -webkit-transform 0.6s cubic-bezier(0.8, 0.2, 0.1, 0.8) 0.1s;
  transition: background 0.4s linear, -webkit-transform 0.6s cubic-bezier(0.8, 0.2, 0.1, 0.8) 0.1s;
  transition: transform 0.6s cubic-bezier(0.8, 0.2, 0.1, 0.8) 0.1s, background 0.4s linear;
  transition: transform 0.6s cubic-bezier(0.8, 0.2, 0.1, 0.8) 0.1s, background 0.4s linear, -webkit-transform 0.6s cubic-bezier(0.8, 0.2, 0.1, 0.8) 0.1s;
  cursor: pointer;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}
.card :last-child {
  margin-bottom: 0;
}
.card--next {
  z-index: 5;
  -webkit-transform: translateY(-25px) rotate(4deg) translateX(25px) scale(1);
          transform: translateY(-25px) rotate(4deg) translateX(25px) scale(1);
}
.card--out {
  -webkit-animation: card-out 0.6s cubic-bezier(0.8, 0.2, 0.1, 0.8);
          animation: card-out 0.6s cubic-bezier(0.8, 0.2, 0.1, 0.8);
  -webkit-transform: translateY(-50px) rotate(8deg) translateX(55px) scale(0.95);
          transform: translateY(-50px) rotate(8deg) translateX(55px) scale(0.95);
  z-index: 1;
  background: #bbb;
}
@-webkit-keyframes card-out {
  0% {
    z-index: 20;
    -webkit-transform: translateY(0px) rotate(-4deg);
            transform: translateY(0px) rotate(-4deg);
  }
  50% {
    -webkit-transform: translateY(-120%) rotate(-5deg) translateX(-40px);
            transform: translateY(-120%) rotate(-5deg) translateX(-40px);
  }
  80% {
    z-index: 1;
  }
  100% {
    -webkit-transform: translateY(-50px) rotate(8deg) translateX(55px) scale(0.95);
            transform: translateY(-50px) rotate(8deg) translateX(55px) scale(0.95);
  }
}
@keyframes card-out {
  0% {
    z-index: 20;
    -webkit-transform: translateY(0px) rotate(-4deg);
            transform: translateY(0px) rotate(-4deg);
  }
  50% {
    -webkit-transform: translateY(-120%) rotate(-5deg) translateX(-40px);
            transform: translateY(-120%) rotate(-5deg) translateX(-40px);
  }
  80% {
    z-index: 1;
  }
  100% {
    -webkit-transform: translateY(-50px) rotate(8deg) translateX(55px) scale(0.95);
            transform: translateY(-50px) rotate(8deg) translateX(55px) scale(0.95);
  }
}
.card--current {
  cursor: auto;
  -webkit-user-select: auto;
     -moz-user-select: auto;
      -ms-user-select: auto;
          user-select: auto;
  position: relative;
  z-index: 10;
  opacity: 1;
  background: #EEE;
  -webkit-transform: rotate(-1deg) translateX(0%) scale(1);
          transform: rotate(-1deg) translateX(0%) scale(1);
}
h1 {
  margin: 0;
}
html,
body {
  height: 100%;
}
body {
  padding: 40px;
  background: #222232;
}