body {
    background-image: url(https://i.pinimg.com/736x/50/b2/01/50b2019553e5b60737bbfcb5f704e285.jpg);
    background-size: cover;
    background-position: center;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 400px;
    margin: 80px auto;
    padding: 25px 30px;
    background: rgba(42, 28, 20, 0.9);
    border-radius: 15px;
    box-shadow: 0 8px 18px rgba(0,0,0,0.4);
    text-align: center;
    color: #fff;
}

.container h1 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #d1f7e1;
}

.container input[type="number"] {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border: 2px solid #a6e3c5;
    border-radius: 10px;
    background: #fff;
    color: #333;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.container input[type="number"]:focus {
    border-color: #7ed9a6;
    box-shadow: 0 0 8px rgba(126, 217, 166, 0.8);
    outline: none;
}

.container input[type="button"] {
    width: 100%;
    padding: 12px;
    margin-top: 15px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    background: linear-gradient(135deg, #6d8d83, #c8e2df);
    color: #d1f7e1;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s ease;
}

.container input[type="button"]:hover {
    background: linear-gradient(135deg, #48423f, #e2d6c8);
    transform: scale(1.05);
}

#output {
    margin-top: 20px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.85);
    border-radius: 10px;
    color: #333;
    font-size: 1.1rem;
    box-shadow: 0 5px 10px rgba(0,0,0,0.2);
}