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

body {
  height: 100vh;
  display: flex;
  background: #ffffff;
}
.toplogo{
    position: absolute;
    text-align: center;
    margin-top: 10px;
    width: 100%;
}
.memory-game {
  width: 100%;
  padding: 30px;
  transform: translateY(30px);
  height: calc(100% - 50px);
  margin: auto;
  display: flex;
  flex-wrap: wrap;
  perspective: 1000px;
}

.memory-card {
  width: calc(25% - 10px);
  height: calc(33.333% - 10px);
  margin: 5px;
  position: relative;
  object-fit: cover;
  transform: scale(1);
  transform-style: preserve-3d;
  transition: transform .5s;
}

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

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

.front-face,
.back-face {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  outline: 2px solid #0000004d;
  border-radius: 10px;
  background: #ffffff;
  backface-visibility: hidden;
}

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