* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: 'Special Elite', cursive;
  background-color: rgba(241, 255, 43, 0.1);
}
.container {
  max-width: 100%;
  min-width: 320px;
}

.game-container {
  width: 640px;
  height: 640px;
  margin: auto;
  display: flex;
  flex-wrap: wrap;
  perspective: 1000px;
  transition: .5s ease;
  transform: translateY(0);
}

@media screen and (max-width: 549px) {
  .game-container {
    width: 320px;
    height: 320px;
  }
}

.game-container.hidden {
  transform: translateY(-1500px);
}

.card {
  width: calc(25% - 10px);
  height: calc(25% - 10px);
  margin: 5px;
  border-radius: 10px;
  box-shadow: 1px 1px 1px rgba(0,0,0,.5);
  position: relative;
  transition:  .25s ease;
  transform-style: preserve-3d;
}
@media screen and (max-width: 549px) {
  .card {
    width: calc(25% - 5px);
    height: calc(25% - 5px);
    margin: 2.5px;
  }
}

.card:hover {
  transform: scale(.98);
}

.card:active {
  transform: scale(.95);
  transition: transform .25s ease;
}

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

.card.succes {
  background-color: rgba(0, 243, 130, 0.3);
}

.card.wrong {
  background-color: rgba(247, 3, 3, 0.4);
}

.front-part, .back-part {
  position: absolute;
  padding: 25px;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
}

@media screen and (max-width: 549px) {
  .front-part, .back-part {
    padding: 5px;
}
}
.front-part {
  background-image: url('../img/texture-2.png');
  border-radius: 10px;
  background-size: cover;
}

.back-part {
  transform: rotateY(180deg);
  border-radius: 10px;
}

.modal-container {
  text-align: center;
  color: #5D174C;
  font-size: 30px;
  margin-top: 15%;
  transform: translate(-50%, 0);
  position: absolute;
  top: 0;
  left: 50%;
  transition: .5s ease;
}

.modal-container h2 {
  font-size: 50px;
}

.modal-container.modal-hidden {
  transform: translate(-50%, -1500px);
}

.modal-btn {
  width: 40px;
  height: 20px;
}

/************button**************/
.button {
  margin-top: 40px;
  display: inline-block;
  border: none;
  color: #fff;
  text-decoration: none;
  background-color: #5D174C;
  padding: 15px 45px;
  font-size: 13px;
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 3px;
  border-radius: 2px;
  text-align: center;
  position: relative;
  outline: none;
  transition: background-color .1s ease;
  border-radius: 5px;
}

.button::after {
  transition: background-color .2s ease;
  position: absolute;
  content: '';
  height: 4px;
  bottom: 0;
  width: 100%;
  background-color: black;
  opacity: .18;
  border-bottom-left-radius: 2px;
  border-bottom-right-radius: 2px;
  left: 0;
}

.button:focus, .button:hover {
  text-decoration: none;
  color: #fff;
}

.button:hover {
  background-color: #711c5d;
}

.button:hover::after {
  opacity: .22;
}

.button:active {
  background-color: #49123b;
}

.button:active::after {
  opacity: .32;
}