style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(135deg, #f4fb8f, #ff6b6b);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.coin-container {
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 20px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
    padding: 2rem;
    text-align: center;
    width: 80%;
    max-width: 500px;
    perspective: 1000px;
}

h1,
.result {
    font-size: 2.5rem;
    margin: 0 0 1rem;
    background: linear-gradient(135deg, #f4fb8f, #ff6b6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 2px 2px 3px rgba(0, 0, 0, 0.5);
}

.coin {
    width: 150px; 
    height: 150px;
    border-radius: 50%;
    background: linear-gradient(135deg, #f4fb8f, #ff6b6b);
    box-shadow: 1px 5px 8px rgba(0, 0, 0, 0.5);
    margin: 0 auto;
    transition: transform 1s ease-in-out;
    backface-visibility: hidden;
    display: flex; 
    justify-content: center; 
    align-items: center; 
    font-size: 1.5rem;
    color: white;
    overflow: hidden;
}

.coin img {
    max-width: 100%;
    max-height: 100%;
}

button {
    background-color: #4e6bff;
    border: none;
    padding: 10px 20px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease-in-out, transform 0.2s ease-in-out;
    width: 100%;
    margin-top: 20px;
}

button:hover {
    background-image: linear-gradient(45deg, #4e6bff, #ff6b6b);
    transform: scale(1.05);
}

.coin:hover {
    transform: scale(1.1);
    transition: 1s ease-in-out;
}

@keyframes spin {
    0% {
        transform: rotateY(0deg);
    }
    100% {
        transform: rotateY(1800deg); 
    }
}

.coin.flip {
    animation: spin 4s cubic-bezier(0.4, 2.5, 0.6, 0.5);
}

.modal {
    display: none;
    /* Hide the modal by default */
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    width: 80%;
}

.close-button {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close-button:hover {
    color: black;
    cursor: pointer;
}

.custom-button {
    color: #fff;
    border: none;
    padding: 10px 20px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease-in-out, transform 0.2s ease-in-out;
    width: 100%;
    margin-top: 20px;
}

.custom-button:hover {
    background-image: linear-gradient(45deg, #4e6bff, #ff6b6b);
    transform: scale(1.05);
}