style.css

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(to right, #4CAF50, #45a049);
    transition: background 0.5s ease-in-out;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.9); /* Slightly transparent white */
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    animation: fadeIn 0.5s ease-out;
    transition: background-color 0.5s ease-in-out;
}

form {
    display: flex;
    flex-direction: column;
}

label {
    margin-bottom: 8px;
}

input {
    padding: 10px;
    margin-bottom: 16px;
    border: 1px solid #ddd;
    border-radius: 5px;
    transition: border-color 0.3s ease-in-out;
}

input:focus {
    border-color: #4CAF50;
}

button {
    padding: 12px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease-in-out;
}

button:hover {
    background-color: #45a049;
}

#result {
    margin-top: 20px;
    font-size: 18px;
    animation: slideIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideIn {
    from {
        margin-top: -20px;
        opacity: 0;
    }
    to {
        margin-top: 0;
        opacity: 1;
    }
}