* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
body {
  background-color: rgb(223, 223, 223);
}
.game_title {
  text-align: center;
  margin-top: 5vh;
  font-size: 32px;
  font-family: "Inconsolata", monospace;
  font-weight: 500;
}
.game_field {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px 10px;
  margin-left: auto;
  margin-right: auto;
  margin-top: 30px;
  width: 630px;
}
.flip-container {
  perspective: 1000px;
}

.flip-container.clicked .flipper {
  transform: rotateY(180deg);
}
.flip-container.clicked.hidden {
  visibility: hidden;
}
.front img,
.back img {
  cursor: pointer;
  width: 150px;
  height: 150px;
  border: 2px solid rgb(71, 68, 68);
  border-radius:5px;
}
.flip-container {
  width: 150px;
  height: 150px;
}

.flipper {
  transition: 0.6s;
  transform-style: preserve-3d;
  position: relative;
}

.front,
.back {
  backface-visibility: hidden;
  position: absolute;
  top: 0;
  left: 0;
}
.front {
  z-index: 2;
  transform: rotateY(0deg);
}
.back {
  transform: rotateY(180deg);
}
@media (max-width: 660px) {
  .game_field {
    grid-template-columns: repeat(3, 1fr);
    width: 320px;
    gap: 5px 5px;
  }
  .front img,
  .back img {
    width: 103px;
    height: 103px;
  }
  .flip-container {
    width: 103px;
    height: 103px;
  }
}