@font-face {
  font-family: caesarDressingRegular;
  src: url("caesarDressingRegular.ttf");
}

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

html {
  font-size: 62.5%;
  font-family: caesarDressingRegular;
  /* background: url(togepi-bg.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover; */
}

body {
  height: 100vh;
  display: flex;
  background: #333;
}

.intro {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  text-align: center;
  padding: 20px;
  color: white;
}

.intro h1 {
  font-size: 3rem;
}

.intro p {
  font-size: 1.5rem;
}

.memory-game {
  width: 640px;
  height: 640px;
  margin: 100px auto auto auto;
  display: flex;
  flex-wrap: wrap;
  perspective: 1000px;
  /* border: 2px solid lime; */
}

.memory-card {
  width: calc(25% - 10px);
  height: calc(33.333% - 10px);
  position: relative;
  margin: 5px;
  transform: scale(1);
  transform-style: preserve-3d;
  transition: transform 0.5s;
  /* border: 2px solid aqua; */
}

.memory-card:active {
  transform: scale(0.97);
  transition: transform 0.2s;
}

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

/* img {
  width: 100px;
} */

.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);
}