body {
        font-family: Arial, sans-serif;
        background: linear-gradient(135deg, #4e73df, #1cc88a);
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh;
        margin: 0;
    }

    .converter {
        background: white;
        padding: 30px;
        border-radius: 10px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.2);
        width: 350px;
        text-align: center;
    }

    h2 {
        margin-bottom: 20px;
        color: #333;
    }

    input, select {
        width: 100%;
        padding: 10px;
        margin: 10px 0;
        border-radius: 5px;
        border: 1px solid #ccc;
        font-size: 16px;
    }

    button {
        width: 100%;
        padding: 12px;
        background: #4e73df;
        color: white;
        border: none;
        border-radius: 5px;
        font-size: 16px;
        cursor: pointer;
        transition: 0.3s;
    }

    button:hover {
        background: #2e59d9;
    }

    .result {
        margin-top: 20px;
        font-weight: bold;
        color: #1cc88a;
        font-size: 18px;
    }