* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: 'Finger Paint', cursive;
}

body {
  /* height: 100vh; */
  display: flex;
  flex-direction: column;
  align-content: center;
  justify-content: center;
  align-items: center;
}

.memory-game {
  width: 640px;
  height: 640px;
  margin: auto;
  display: flex;
  align-content: center;
  justify-content: center;
  flex-wrap: wrap;
}

.memory-card {
  width: 18%;
  height: 25%;
  margin: 5px;
  position: relative;
  transform: scale(1);
  transform-style: preserve-3d;
  transition: transform .5s;
  box-shadow: 1px 1px 1px rgba(0,0,0,.3);
}

.memory-card:active {
  transform: scale(0.97);
  transition: transform .2s;
}

.memory-card.flip {
  transform: rotateY(180deg);
}

.front-face,
.back-face {
  width: 100%;
  height: 100%;
  padding: 20px;
  position: absolute;
  border-radius: 5px;
  /* background: #1C7CCC; */
  backface-visibility: hidden;
}

.front-face {
  transform: rotateY(180deg);
}
h1{
  margin: 20% 0 0;
}
button{
    background-color: #ffc800;
    border: none;
    padding: 16px 32px;
    text-align: center;
    font-size: 16px;
    margin: 4px 2px;
    transition: 0.3s;
}