* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  background: black;
  min-height: 100%;
  font-family: "Arial", sans-serif;
}

.head-txt{
  text-align: center;
  color: white;
  padding: 2rem 0;
  font-size: 1.5rem;
}

.wrap {
  position: relative;
  height: 100%;
  min-height: 500px;
  padding-bottom: 20px;
}

.game {
  transform-style: preserve-3d;
  perspective: 500px;
  min-height: 100%;
  height: 100%;
  margin: 0rem 10rem 0 10rem;
}

@-webkit-keyframes matchAnim {
  0% {
    background: #bcffcc;
  }
  100% {
    background: white;
  }
}

@keyframes matchAnim {
  0% {
    background: #bcffcc;
  }
  100% {
    background: white;
  }
}
.card {
  float: left;
  width: 16.66666%;
  height: 20%;
  padding: 5px;
  text-align: center;
  display: block;
  perspective: 500px;
  position: relative;
  cursor: pointer;
  z-index: 50;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}
@media (max-width: 800px) {
  .card {
    width: 25%;
    height: 16.666%;
  }
}
.card .inside {
  width: 100%;
  height: 100%;
  display: block;
  transform-style: preserve-3d;
  transition: 0.4s ease-in-out;
  background: white;
}
.card .inside.picked, .card .inside.matched {
  transform: rotateY(180deg);
}
.card .inside.matched {
  -webkit-animation: 1s matchAnim ease-in-out;
          animation: 1s matchAnim ease-in-out;
  -webkit-animation-delay: 0.4s;
          animation-delay: 0.4s;
}
.card .front, .card .back {
  border: 1px solid black;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 20px;
}
.card .front img, .card .back img {
  max-width: 100%;
  display: block;
  margin: 0 auto;
  max-height: 100%;
}
.card .front {
  transform: rotateY(-180deg);
}
@media (max-width: 800px) {
  .card .front {
    padding: 5px;
  }
}
.card .back {
  transform: rotateX(0);
}
@media (max-width: 800px) {
  .card .back {
    padding: 10px;
  }
}

.modal-overlay {
  display: none;
  background: rgba(0, 0, 0, 0.8);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.modal {
  display: none;
  position: relative;
  width: 500px;
  margin: 0 auto;
  background: white;
  top: 50%;
  transform: translateY(-50%);
  padding: 30px;
}
.modal .winner {
  font-size: 80px;
  text-align: center;
  font-family: "Anton", sans-serif;
  color: #4d4d4d;
  text-shadow: 0px 3px 0 black;
}
@media (max-width: 480px) {
  .modal .winner {
    font-size: 60px;
  }
}
.modal .restart {
  font-family: "Anton", sans-serif;
  margin: 30px auto;
  padding: 20px 30px;
  display: block;
  font-size: 30px;
  border: none;
  background: #4d4d4d;
  background: linear-gradient(#4d4d4d, #222);
  border: 1px solid #222;
  border-radius: 5px;
  color: white;
  text-shadow: 0px 1px 0 black;
  cursor: pointer;
}
.modal .restart:hover {
  background: linear-gradient(#222, black);
}

@media (max-width: 500px)
{
    .game
    {
        margin: 50px 20px 0px 20px;
    }
    .card
    {
        width: 25%;
        height: 10%;
    }
}