.bg-image {
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    height: 100%; 
}


.card {
    height: 400px;
}

.flip-card1 {
    background-color: transparent;
    height: 390px;
    width: 250px;
    perspective: 1000px;
  }
  
  .flip-card-inner1 {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
  }
  
  .flip-card1:hover .flip-card-inner1 {
    transform: rotateY(180deg);
  }
  
  .flip-card-front1, .flip-card-back1 {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
  }
  
  .flip-card-front1 {
    background-color: #b5c4b56c;
    color: black;
  }
  
  .flip-card-back1 {
    background-color: #05860b6c;
    color: white;
    transform: rotateY(180deg);
  }
  
  .flip-card2 {
    background-color: transparent;
    height: 390px;
    width: 250px;
    perspective: 1000px;
  }
  
  .flip-card-inner2 {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
  }
  
  .flip-card2:hover .flip-card-inner2 {
    transform: rotateY(180deg);
  }
  
  .flip-card-front2, .flip-card-back2 {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
  }
  
  .flip-card-front2 {
    background-color: #b5c4b56c;
    color: black;
  }
  
  .flip-card-back2 {
    background-color: #0a3dc97e;
    color: white;
    transform: rotateY(180deg);
  }
  
  .flip-card3 {
    background-color: transparent;
    height: 390px;
    width: 250px;
    perspective: 1000px;
  }
  
  .flip-card-inner3 {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
  }
  
  .flip-card3:hover .flip-card-inner3 {
    transform: rotateY(180deg);
  }
  
  .flip-card-front3, .flip-card-back3 {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
  }
  
  .flip-card-front3 {
    background-color: #b5c4b56c;
    color: black;
  }
  
  .flip-card-back3 {
    background-color: #cc010167;
    color: white;
    transform: rotateY(180deg);
  }

  .flip-card4 {
    background-color: transparent;
    height: 390px;
    width: 250px;
    perspective: 1000px;
  }
  
  .flip-card-inner4 {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
  }
  
  .flip-card4:hover .flip-card-inner4 {
    transform: rotateY(180deg);
  }
  
  .flip-card-front4, .flip-card-back4 {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
  }
  
  .flip-card-front4 {
    background-color: #b5c4b56c;
    color: black;
  }
  
  .flip-card-back4 {
    background-color: #e6bf0f60;
    color: white;
    transform: rotateY(180deg);
  }

  .glow-on-hover {
    width: 220px;
    height: 50px;
    border: none;
    outline: none;
    color: #fff;
    background: #111;
    cursor: pointer;
    position: relative;
    z-index: 0;
    border-radius: 10px;
}

.glow-on-hover:before {
    content: '';
    background: linear-gradient(45deg, #ff0000, #ff7300, #fffb00, #48ff00, #00ffd5, #002bff, #7a00ff, #ff00c8, #ff0000);
    position: absolute;
    top: -2px;
    left:-2px;
    background-size: 400%;
    z-index: -1;
    filter: blur(5px);
    width: calc(100% + 4px);
    height: calc(100% + 4px);
    animation: glowing 20s linear infinite;
    opacity: 0;
    transition: opacity .3s ease-in-out;
    border-radius: 10px;
}

.glow-on-hover:active {
    color: #000
}

.glow-on-hover:active:after {
    background: transparent;
}

.glow-on-hover:hover:before {
    opacity: 1;
}

.glow-on-hover:after {
    z-index: -1;
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: #111;
    left: 0;
    top: 0;
    border-radius: 10px;
}

@keyframes glowing {
    0% { background-position: 0 0; }
    50% { background-position: 400% 0; }
    100% { background-position: 0 0; }
}