style.css

@import url('https://fonts.googleapis.com/css?family=Noto+Serif');
*{
    margin: 0;
}
body{
    padding: 0;
    max-height: 100vh;
    height: 100vh;
    max-width: 100vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: #141414;
    font-family: 'Noto Serif', serif;
}
#stats{
  width: 65vh;
  height: 10vh;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  align-content: center;
  justify-items: center;
  background: url("images/stats.svg"), #ffffffbb;
  margin-bottom: 20px;
  box-shadow: 0 0 6px white;
  z-index: 3;
  font-size: 20px;
  line-height: 1.4
}
@media screen and (max-width:1000px), screen and (max-height: 700px){
  #stats{
    font-size: 16px;
  }
}
#stats div{
  display: flex;
  flex-direction: column;
  text-align: center;
}

#game{
    display: grid;
    width: 65vh;
    height: 65vh;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
    column-gap: 10px;
    row-gap: 10px;
    position: relative;
    z-index: 3;
}
#game.end::before{
    content: 'Good job with this one 👍🐱‍👤';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-color: rgba(0,0,0,.5);
    z-index: 3;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 35px;
    text-align: center;
}
#game.over::before{
  content: 'At least you tried 😫';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: rgba(0,0,0,.5);
  z-index: 3;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 35px;
  text-align: center;
}
#game.loading::before{
  content: 'Loading';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(#59a4f8, #186dcb);
  z-index: 3;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 35px;
  text-align: center;
}
.card{
    transition: transform 1s;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: linear-gradient(#59a4f8, #186dcb);
    border-radius: 2px;
    box-shadow: 0 0 15px black
}
.card.front{
    pointer-events: none;
}
.card.back{
    cursor: pointer;
}
.card img{
  width: 50%;
  height: auto;
    pointer-events: none;
    -webkit-user-select: none;  /* Chrome all / Safari all */
    -moz-user-select: none;     /* Firefox all */
    -ms-user-select: none;      /* IE 10+ */
    user-select: none;          /* Likely future */   
}
.card.back img{
    -webkit-animation-duration: 0.75s;
    animation-duration: 0.75s;
    -webkit-animation-fill-mode: forwards;
    animation-fill-mode: forwards;
    -webkit-animation-name: bounceOut;
    animation-name: bounceOut;
}
.card.front img{
    -webkit-animation-duration: 0.75s;
    animation-duration: 0.75s;
    -webkit-animation-fill-mode: forwards;
    animation-fill-mode: forwards;
    -webkit-animation-name: bounceIn;
    animation-name: bounceIn;
}

#water {
  --size: 7vh;
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  top: calc(100vh - var(--size));
  pointer-events: none;
  background: url("images/wave.svg");
  background-repeat: repeat-x;
  /* background-size: var(--size) calc( var(--size) / 0.9 ); */
  background-position: 0 bottom;
  animation: waves 20s linear infinite alternate;
  transition: top 3s;
}
@keyframes waves {
  0%{background-position: 0% bottom;}
  100%{background-position: 100% bottom;}
}

/* Animations from Animate.css */
@-webkit-keyframes bounceIn {
    from,
    20%,
    40%,
    60%,
    80%,
    to {
      -webkit-animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
      animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
    }
  
    0% {
      opacity: 0;
      -webkit-transform: scale3d(0.3, 0.3, 0.3);
      transform: scale3d(0.3, 0.3, 0.3);
    }
  
    20% {
      -webkit-transform: scale3d(1.1, 1.1, 1.1);
      transform: scale3d(1.1, 1.1, 1.1);
    }
  
    40% {
      -webkit-transform: scale3d(0.9, 0.9, 0.9);
      transform: scale3d(0.9, 0.9, 0.9);
    }
  
    60% {
      opacity: 1;
      -webkit-transform: scale3d(1.03, 1.03, 1.03);
      transform: scale3d(1.03, 1.03, 1.03);
    }
  
    80% {
      -webkit-transform: scale3d(0.97, 0.97, 0.97);
      transform: scale3d(0.97, 0.97, 0.97);
    }
  
    to {
      opacity: 1;
      -webkit-transform: scale3d(1, 1, 1);
      transform: scale3d(1, 1, 1);
    }
  }
  
  @keyframes bounceIn {
    from,
    20%,
    40%,
    60%,
    80%,
    to {
      -webkit-animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
      animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
    }
  
    0% {
      opacity: 0;
      -webkit-transform: scale3d(0.3, 0.3, 0.3);
      transform: scale3d(0.3, 0.3, 0.3);
    }
  
    20% {
      -webkit-transform: scale3d(1.1, 1.1, 1.1);
      transform: scale3d(1.1, 1.1, 1.1);
    }
  
    40% {
      -webkit-transform: scale3d(0.9, 0.9, 0.9);
      transform: scale3d(0.9, 0.9, 0.9);
    }
  
    60% {
      opacity: 1;
      -webkit-transform: scale3d(1.03, 1.03, 1.03);
      transform: scale3d(1.03, 1.03, 1.03);
    }
  
    80% {
      -webkit-transform: scale3d(0.97, 0.97, 0.97);
      transform: scale3d(0.97, 0.97, 0.97);
    }
  
    to {
      opacity: 1;
      -webkit-transform: scale3d(1, 1, 1);
      transform: scale3d(1, 1, 1);
    }
  }
  
  .bounceIn {
    -webkit-animation-duration: 0.75s;
    animation-duration: 0.75s;
    -webkit-animation-name: bounceIn;
    animation-name: bounceIn;
  }

  @-webkit-keyframes bounceOut {
  20% {
    -webkit-transform: scale3d(0.9, 0.9, 0.9);
    transform: scale3d(0.9, 0.9, 0.9);
  }

  50%,
  55% {
    opacity: 1;
    -webkit-transform: scale3d(1.1, 1.1, 1.1);
    transform: scale3d(1.1, 1.1, 1.1);
  }

  to {
    opacity: 0;
    -webkit-transform: scale3d(0.3, 0.3, 0.3);
    transform: scale3d(0.3, 0.3, 0.3);
  }
}

@keyframes bounceOut {
  20% {
    -webkit-transform: scale3d(0.9, 0.9, 0.9);
    transform: scale3d(0.9, 0.9, 0.9);
  }

  50%,
  55% {
    opacity: 1;
    -webkit-transform: scale3d(1.1, 1.1, 1.1);
    transform: scale3d(1.1, 1.1, 1.1);
  }

  to {
    opacity: 0;
    -webkit-transform: scale3d(0.3, 0.3, 0.3);
    transform: scale3d(0.3, 0.3, 0.3);
  }
}

.bounceOut {
  -webkit-animation-duration: 0.75s;
  animation-duration: 0.75s;
  -webkit-animation-name: bounceOut;
  animation-name: bounceOut;
}