html {
  box-sizing: border-box;
  font-size: 10px;
  background: #ffc600;
}

*, *:before, *:after {
  box-sizing: inherit;
}

body {
  padding: 0;
  margin: 0;
  font-family: 'Amatic SC', cursive;
  text-align: center;
}

h1 {
  text-align: center;
  font-size: 10rem;
  line-height: 1;
  margin-bottom: 0;
}

.title {
  display: flex;
  justify-content: center;
}

.score {
  background: rgba(255, 255, 255, 0.2);
  padding: 0 3rem;
  line-height: 1;
  border-radius: 1rem;
}

.game {
  width: 600px;
  height: 400px;
  display: flex;
  flex-wrap: wrap;
  margin: 0 auto;
}

.hole {
  flex: 1 0 33.33%;
  overflow: hidden;
  position: relative;
}

.hole:after {
  display: block;
  background: url("image/dirt.svg") bottom center no-repeat;
  background-size: contain;
  content: '';
  width: 100%;
  height: 70px;
  position: absolute;
  z-index: 2;
  bottom: -30px;
}

.mole {
  background: url("image/mole.svg") bottom center no-repeat;
  background-size: 60%;
  position: absolute;
  top: 100%;
  width: 100%;
  height: 100%;
  transition: all 0.4s;
  pointer-events: auto;
}

.hole.up .mole {
  top: 0;
}

.bubbly-button {
  font-family: 'Helvetica', 'Arial', sans-serif;
  display: inline-block;
  font-size: 2em;
  padding: 1em 2em;
  margin-top: 50px;
  /*margin-bottom: 60px;*/
  -webkit-appearance: none;
  appearance: none;
  background-color: #FFA000;
  color: #fff;
  border-radius: 20px;
  border: none;
  cursor: pointer;
  position: relative;
  transition: transform ease-in 0.1s, box-shadow ease-in 0.25s;
  box-shadow: 0 2px 25px #FF9800;
}

.bubbly-button:focus {
  outline: 0;
}
.bubbly-button:before, .bubbly-button:after {
  position: absolute;
  content: '';
  display: block;
  width: 140%;
  height: 100%;
  left: -20%;
  z-index: -1000;
  transition: all ease-in-out 0.5s;
  background-repeat: no-repeat;
}
.bubbly-button:before {
  display: none;
  top: -75%;
  background-image: radial-gradient(circle, #FFA000 20%, transparent 20%), radial-gradient(circle, transparent 20%, #FFA000 20%, transparent 30%), radial-gradient(circle, #FFA000 20%, transparent 20%), radial-gradient(circle, #FFA000 20%, transparent 20%), radial-gradient(circle, transparent 10%, #FFA000 15%, transparent 20%), radial-gradient(circle, #FFA000 20%, transparent 20%), radial-gradient(circle, #FFA000 20%, transparent 20%), radial-gradient(circle, #FFA000 20%, transparent 20%), radial-gradient(circle, #FFA000 20%, transparent 20%);
  background-size: 10% 10%, 20% 20%, 15% 15%, 20% 20%, 18% 18%, 10% 10%, 15% 15%, 10% 10%, 18% 18%;
}
.bubbly-button:after {
  display: none;
  bottom: -75%;
  background-image: radial-gradient(circle, #FFA000 20%, transparent 20%), radial-gradient(circle, #FFA000 20%, transparent 20%), radial-gradient(circle, transparent 10%, #FFA000 15%, transparent 20%), radial-gradient(circle, #FFA000 20%, transparent 20%), radial-gradient(circle, #FFA000 20%, transparent 20%), radial-gradient(circle, #FFA000 20%, transparent 20%), radial-gradient(circle, #FFA000 20%, transparent 20%);
  background-size: 15% 15%, 20% 20%, 18% 18%, 20% 20%, 15% 15%, 10% 10%, 20% 20%;
}
.bubbly-button:active {
  transform: scale(0.9);
  background-color: #FF9800;
  box-shadow: 0 2px 25px #FF9800;
}
.bubbly-button.animate:before {
  display: block;
  animation: topBubbles ease-in-out 0.75s forwards;
}
.bubbly-button.animate:after {
  display: block;
  animation: bottomBubbles ease-in-out 0.75s forwards;
}

@keyframes topBubbles {
  0% {
    background-position: 5% 90%, 10% 90%, 10% 90%, 15% 90%, 25% 90%, 25% 90%, 40% 90%, 55% 90%, 70% 90%;
  }
  50% {
    background-position: 0 80%, 0 20%, 10% 40%, 20% 0, 30% 30%, 22% 50%, 50% 50%, 65% 20%, 90% 30%;
  }
  100% {
    background-position: 0 70%, 0 10%, 10% 30%, 20% -10%, 30% 20%, 22% 40%, 50% 40%, 65% 10%, 90% 20%;
    background-size: 0 0, 0 0,  0 0,  0 0,  0 0,  0 0;
  }
}
@keyframes bottomBubbles {
  0% {
    background-position: 10% -10%, 30% 10%, 55% -10%, 70% -10%, 85% -10%, 70% -10%, 70% 0;
  }
  50% {
    background-position: 0 80%, 20% 80%, 45% 60%, 60% 100%, 75% 70%, 95% 60%, 105% 0;
  }
  100% {
    background-position: 0 90%, 20% 90%, 45% 70%, 60% 110%, 75% 80%, 95% 70%, 110% 10%;
    background-size: 0 0, 0 0,  0 0,  0 0,  0 0,  0 0;
  }
}