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

body {
  height: 100vh;
  background: #fffacd;
  font-family: 'Short Stack';
}

.container {
  justify-content: center
}

.center {
        margin: auto;
        width: 30%;
        padding: 10px;
    }

    button {
      cursor: pointer;
      width: 50%;
      height: 5%;
      background-color: #b0c4de;
      margin-left: 25%;S
    }

    .timer {
      font-family: sans-serif;
      margin: auto;
      width: 30%;
      padding-left: 5%
    }

.memory-game {
  width: 640px;
  height: 640px;
  margin: auto;
  display: flex;
  flex-wrap: wrap;
  perspective: 1000px;
}

.memory-card {
  width: calc(25% - 10px);
  height: calc(33.333% - 10px);
  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: #b0c4de;
  backface-visibility: hidden;
}

.front-face {
  transform: rotateY(180deg);
}

button {
  cursor: pointer;
  width: 50%;
  height: 5%;
  background-color: #b0c4de;
  margin-left: 25%;
  color: white;
  padding: 3%;
  font-family: 'Short Stack';
}

.timer {
  font-family: sans-serif;
  margin: auto;
  width: 40%;
  color: #b0c4de;
}

.disabled {
  color: #757575;
}

header {
  text-align: center;
  font-size: 200%;
  color: #b0c4de;
  font-weight: bold;
  font-family: 'Nosifer';
}

nft-card {
  padding: 50px;
}