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

 /* font-family: "VT323", monospace; */
}

body {
  height: 100vh; 
/*  background-image: url("https://");   */
  background-size: cover;
  background-position: center;
  position: relative;

}

.open {
  width: (100%);
  display: block;
  justify-content: center;
  align-items: center;
  margin-top: 100px;
}

.mainTag {
  color: #ccc;			/* #c5c5c5; */
  font-weight: bolder;
} 

.welcome {
  color: #fff;
  font-weight: 800;
  width: 70%;
  margin: auto;
  margin-bottom: 20px;
}

.btn-handle {  border: 2px solid #2580b3;  color: #fff;		}

.btn-handle:hover {  background: linear-gradient(115.87deg, #14f1d9 0%, #3672f8 100%);		}

.headTag,
.points > p {
  color: #c5c5c5;			/* color: #c5c5c5; */
  font-weight: bolder;
}

#point {  font-weight: 1300;	}

.memory-game {
  width: calc(25% - 10px);
  height: calc(33.333% - 10px);
  margin: auto;
  display: flex;
  flex-wrap: wrap;
  perspective: 500px; /*  perspective: 1000px; */ 
  z-index: -1;
}

.memory-card {
  width: calc(25% - 10px);
  height: calc(33.333% - 10px);
  margin: 5px;
  position: relative;
  transform: scale(1);
  transform-style: preserve-3d;
  transition: transform 0.5s;
  border-radius: 5px;
  background-image: linear-gradient(-225deg, #76c3f0 0%, #2580b3 100%);
}

.memory-card:active {
  transform: scale(0.97);
  transition: transform 0.2s;
}

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

.front-face,
.back-face {
  width: 100%;
  height: 100%;
  padding: 10px;
  position: absolute;
  border-radius: 5px;
  backface-visibility: hidden;
}

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

#won {
  visibility: hidden;
  border-radius: 10px;
  background: #ff0; 			/* #ffbdf1; */
  background-image: linear-gradient(to bottom, #76c3f0 0%, #2580b3 100%);
  margin: auto;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-right: -50%;
  transform: translate(-50%, -50%);
  z-index: 1;
  border: 5px solid #064d75;
}


#won > h1,
#won p { font-weight: bolder; } 

#playAgain {
  border: 2px solid #2580b3;
  border-radius: 5px;
  background: #f00;			/* #2580b3; */
}

#playAgain:hover {
  border: 2px solid #064d75;
  background: linear-gradient(115.87deg, #14f1d9 0%, #3672f8 100%);
}

/*LARGE DEVICES */
@media (min-width: 992px) {
  .mainTag {
    font-size: 80px;
    margin-top: 60px;
  }

  .welcome {
    font-size: 35px;
  }

  .btn-handle {
    font-size: 40px;
    padding: 10px 20px;
    border-radius: 10px;
  }

  .memory-game {
    width: 640px;
    height: 530px;
  }
  .front-face,
  .back-face {
    padding: 10px;
  }
  #won {
    padding: 50px;
  }

  .headTag {
    font-size: 70px;
  }

  .points > p,
  #won > h1,
  #won p,
  #playAgain {
    font-size: 35px;
  }
}


/*medium devices*/

@media (min-width: 768px) and (max-width: 991px) {
  .mainTag {
    font-size: 75px;
    margin-top: 60px;
  }

  .welcome {
    font-size: 30px;
  }

  .btn-handle {
    font-size: 35px;
    padding: 10px 20px;
    border-radius: 10px;
  }

  .memory-game {
    width: 620px;
    height: 512px;
  }

  .front-face,
  .back-face {
    padding: 10px;
  }

  #won {
    padding: 50px;
    top: 40%;
  }

  .headTag {
    font-size: 70px;
  }

  .points > p,
  #won > h1,
  #won p,
  #playAgain {
    font-size: 35px;
  }
}

/*SMALL DEVICES */
@media (min-width: 576px) and (max-width: 767px) {
  .mainTag {
    font-size: 60px;
    margin-top: 50px;
  }

  .welcome {
    font-size: 25px;
  }

  .btn-handle {
    font-size: 30px;
    padding: 10px 20px;
    border-radius: 10px;
  }

  .memory-game {
    width: 480px;
    height: 398px;
  }
  .front-face,
  .back-face {
    padding: 6px;
  }

  #won {
    padding: 35px;
    top: 30%;
  }

  .headTag {
    font-size: 50px;
  }

  .points > p,
  #won > h1,
  #won p,
  #playAgain {
    font-size: 30px;
  }
}

/*EXTRA SMALL DEVICES*/
@media (min-width: 378px) and (max-width: 575px) {
  .mainTag {
    font-size: 45px;
    margin-top: 45px;
  }

  .welcome {
    font-size: 25px;
  }

  .btn-handle {
    font-size: 30px;
    padding: 10px 20px;
    border-radius: 10px;
  }

  .memory-game {
    width: 380px;
    height: 315px;
  }
  .front-face,
  .back-face {
    padding: 6px;
  }

  #won {
    padding: 30px;
    top: 30%;
  }

  .headTag {
    font-size: 45px;
  }

  .points > p,
  #won > h1,
  #won p,
  #playAgain {
    font-size: 25px;
  }
}

/*X-EXTRA SMALL DEVICES */
@media (max-width: 377px) {
  .mainTag {
    font-size: 45px;
    margin-top: 40px;
  }

  .welcome {
    font-size: 20px;
  }

  .btn-handle {
    font-size: 30px;
    padding: 10px 20px;
    border-radius: 10px;
  }

  .memory-game {
    width: 340px;
    height: 282px;
  }

  .front-face,
  .back-face {
    padding: 5px;
  }

  #won {
    padding: 15px;
    top: 30%;
  }

  .headTag {
    font-size: 40px;
  }

  .points > p,
  #won > h1,
  #won p,
  #playAgain {
    font-size: 25px;
  }
}