body {
  height: 100vh;
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: Arial;
}
body.wrong {
  -webkit-animation: bg-red 1s ease-in;
          animation: bg-red 1s ease-in;
}
body.correct {
  -webkit-animation: bg-green 1s ease-in;
          animation: bg-green 1s ease-in;
}

#inspiration {
  position: fixed;
  right: 1em;
  bottom: 1em;
}
#inspiration a {
  display: inline-block;
  float: left;
  text-decoration: none;
  font-weight: bold;
  color: white;
  transition: all 1s ease;
}
#inspiration a:hover {
  color: #212121;
}
#inspiration p {
  margin: 0;
  padding-left: 0.4em;
  display: inline-block;
  float: right;
  color: rgba(255, 255, 255, 0.6);
}

#pin {
  background: #212121;
  width: 20em;
  min-width: 320px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  padding: 1em;
  border-radius: 0.3em;
  box-shadow: 4px 4px 8px rgba(0, 0, 0, 0.3);
  margin: auto;
  color: rgba(255, 255, 255, 0.2);
}

.dots {
  width: 50%;
  display: flex;
  justify-content: space-around;
  padding: 1em;
  padding-top: 3em;
}

.dot {
  position: relative;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 0.8em;
  width: 0.8em;
  height: 0.8em;
  transform: scale3d(0.7, 0.7, 0.7);
}
.dot.active {
  -webkit-animation: growDot 0.5s ease;
          animation: growDot 0.5s ease;
  -webkit-animation-fill-mode: forwards;
          animation-fill-mode: forwards;
}
.dot.wrong {
  -webkit-animation: wrong 0.9s ease;
          animation: wrong 0.9s ease;
}
.dot.correct {
  -webkit-animation: correct 0.9s ease;
          animation: correct 0.9s ease;
}

#pin p {
  font-size: 0.8em;
}

.numbers {
  display: flex;
  flex-flow: row wrap;
  align-items: center;
  justify-content: space-around;
  align-content: flex-end;
  margin: 2em 0;
}

.number {
  position: relative;
  width: 2.5em;
  height: 2.5em;
  margin: 0.5em;
  border-radius: 2.5em;
  border: 2px solid rgba(255, 255, 255, 0);
  text-align: center;
  line-height: 2.5em;
  font-weight: 400;
  font-size: 1.8em;
  cursor: pointer;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  transition: all 0.5s ease;
}
.number:hover {
  color: rgba(255, 255, 255, 0.5);
}
.number:hover:before {
  border: 2px solid rgba(255, 255, 255, 0.5);
}
.number:before {
  content: "";
  position: absolute;
  left: -2px;
  width: 2.5em;
  height: 2.5em;
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 2.5em;
  transition: all 0.5s ease;
}
.number.grow:before {
  -webkit-animation: grow 0.6s ease;
          animation: grow 0.6s ease;
}

@-webkit-keyframes growDot {
  100% {
    background: white;
    transform: scale3d(0.9, 0.9, 0.9);
  }
}

@keyframes growDot {
  100% {
    background: white;
    transform: scale3d(0.9, 0.9, 0.9);
  }
}
@-webkit-keyframes grow {
  50% {
    transform: scale3d(1.5, 1.5, 1.5);
  }
  100% {
    transform: scale3d(1, 1, 1);
  }
}
@keyframes grow {
  50% {
    transform: scale3d(1.5, 1.5, 1.5);
  }
  100% {
    transform: scale3d(1, 1, 1);
  }
}
@-webkit-keyframes wrong {
  20% {
    background: crimson;
  }
  40% {
    transform: translate(-15px, 0);
  }
  60% {
    transform: translate(10px, 0);
  }
  80% {
    transform: translate(-5px, 0);
  }
}
@keyframes wrong {
  20% {
    background: crimson;
  }
  40% {
    transform: translate(-15px, 0);
  }
  60% {
    transform: translate(10px, 0);
  }
  80% {
    transform: translate(-5px, 0);
  }
}
@-webkit-keyframes correct {
  20% {
    background: limegreen;
  }
  40% {
    transform: translate(0, -15px);
  }
  60% {
    transform: translate(0, 10px);
  }
  80% {
    transform: translate(0, -5px);
  }
}
@keyframes correct {
  20% {
    background: limegreen;
  }
  40% {
    transform: translate(0, -15px);
  }
  60% {
    transform: translate(0, 10px);
  }
  80% {
    transform: translate(0, -5px);
  }
}
@-webkit-keyframes bg-red {
  50% {
    background: crimson;
  }
}
@keyframes bg-red {
  50% {
    background: crimson;
  }
}
@-webkit-keyframes bg-green {
  50% {
    background: limegreen;
  }
}
@keyframes bg-green {
  50% {
    background: limegreen;
  }
}