.gst-calculator {
    max-width: 400px;
    margin: 30px auto;
    padding: 20px;
    background: #fdfdfd;
    border: 1px solid #ddd;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    font-family: Arial, sans-serif;
}

.gst-calculator h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
}

.gst-calculator label {
    font-weight: bold;
    display: block;
    margin-top: 15px;
}

.gst-calculator input, .gst-calculator select {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    box-sizing: border-box;
    border-radius: 6px;
    border: 1px solid #ccc;
}

.gst-calculator button {
    margin-top: 20px;
    width: 100%;
    background-color: #0073aa;
    color: white;
    padding: 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
}

.gst-calculator button:hover {
    background-color: #005d8f;
}

.gst-result {
    margin-top: 20px;
    padding: 15px;
    background: #f1f1f1;
    border-radius: 8px;
}