style.css

/* Import Google Font - Poppins */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

p {
    font-size: 20px;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: #6563ff;
}

::selection {
    color: #fff;
    background: #6563ff;
}

.wrapper {
    padding: 25px;
    background: #f8f8f8;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.cards,
.card,
.view,
.details,
p {
    display: flex;
    align-items: center;
    justify-content: center;
}

.cards {
    height: 350px;
    width: 350px;
    flex-wrap: wrap;
    justify-content: space-between;
}

.cards .card {
    cursor: pointer;
    position: relative;
    perspective: 1000px;
    transform-style: preserve-3d;
    height: calc(100% / 4 - 10px);
    width: calc(100% / 4 - 10px);
}

.card.shake {
    animation: shake 0.35s ease-in-out;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    20% {
        transform: translateX(-13px);
    }

    40% {
        transform: translateX(13px);
    }

    60% {
        transform: translateX(-8px);
    }

    80% {
        transform: translateX(8px);
    }
}

.cards .card .view {
    width: 100%;
    height: 100%;
    user-select: none;
    pointer-events: none;
    position: absolute;
    background: #fff;
    border-radius: 7px;
    backface-visibility: hidden;
    transition: transform 0.25s linear;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.card .front-view img {
    max-width: 17px;
}

.card .back-view {
    transform: rotateY(-180deg);
}

.card .back-view img {
    max-width: 40px;
}

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

.card.flip .back-view {
    transform: rotateY(0);
}

.details {
    width: 100%;
    margin-top: 15px;
    padding: 0 20px;
    border-radius: 7px;
    background: #fff;
    height: calc(100% / 4 - 30px);
    justify-content: space-between;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.details p {
    font-size: 18px;
    height: 17px;
    padding-right: 18px;
    border-right: 1px solid #ccc;
}

.details p span {
    margin-left: 8px;
}

.details p b {
    font-weight: 500;
}

.details button {
    cursor: pointer;
    font-size: 14px;
    color: #6563ff;
    border-radius: 4px;
    padding: 4px 11px;
    background: #fff;
    border: 2px solid #6563ff;
    transition: 0.3s ease;
}
ol
{
    
    margin:4px;
    padding: 10px;
    color: aliceblue;
    
    
}
li
{    padding: 4px;
     color: #06053f;
}
.details button:hover {
    color: #fff;
    background: #6563ff;
}
label {
    font-size: 20px;
    margin-right: 10px;
}

#time-input {
    padding: 5px;
    font-size: 1.2em;
    border-radius: 5px;
    border: 1px solid gray;
}

#time-submit {
    padding: 5px 10px;
    background-color: blue;
    color: white;
    border-radius: 5px;
    border: none;
    font-size: 1.2em;
    cursor: pointer;
}

#time-submit:hover {
    background-color: darkblue;
}

@media screen and (max-width: 700px) {
    .cards {
        height: 350px;
        width: 350px;
    }

    .card .front-view img {
        max-width: 16px;
    }

    .card .back-view img {
        max-width: 40px;
    }
}

@media screen and (max-width: 530px) {
    .cards {
        height: 300px;
        width: 300px;
    }

    .card .back-view img {
        max-width: 35px;
    }

    .details {
        margin-top: 10px;
        padding: 0 15px;
        height: calc(100% / 4 - 20px);
    }

    .details p {
        height: 15px;
        font-size: 17px;
        padding-right: 13px;
    }

    .details button {
        font-size: 13px;
        padding: 5px 10px;
        border: none;
        color: #fff;
        background: #6563ff;
    }
}
/* The Modal (background) */
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgba(0, 0, 0, 0.4); /* Black w/ opacity */
  }
  
  /* Modal Content/Box */
  .modal-content {
    background-color: #fefefe;
    margin: 15% auto; /* 15% from the top and centered */
    padding: 20px;
    border: 1px solid #888;
    width: 40%; /* Could be more or less, depending on screen size */
    text-align: center;
    position: relative;
  }
  
  /* Close Button */
  .close-btn {
    position: absolute;
    top: 5px;
    right: 10px;
    font-size: 28px;
    font-weight: bold;
  }
  
  .close-btn:hover,
  .close-btn:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
  }
  
  /* Message Box */
  .message-box {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
  }
  
  #win-box {
    color: green;
    display:none;
  }
  
  #lose-box {
    color: red;
    display:none;
  }