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;
}

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

.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 50px auto;
}

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

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

.mole {
  background: url(mole.png) bottom center no-repeat;
  background-size: 60%;
  position: absolute;
  top: 100%;
  width: 100%;
  height: 100%;
  transition: all 0.4s;
}

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

.btn {
  font-family: 'Amatic SC', cursive;
  font-size: 4rem;
  font-weight: 700;
  padding: 1rem 3rem;
  color: #290947;
  text-transform: uppercase;
  border: 1px solid rgb(#290947);
  position: relative;
  left: 80px;
  top: -80px;
  overflow: hidden;
  background-color: transparent;
}

.btn:hover {
  box-shadow: 1px 1px 25px 10px rgba(83, 28, 134, 0.4);
}

.btn:before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    120deg,
    transparent,
    rgba(83, 28, 134, 0.4),
    transparent
  );
  transition: all 650ms;
}

.btn:hover:before {
  left: 100%;
}