.gst-container {
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 10px;
    background: linear-gradient(to bottom, #FF9933, #FFFFFF, #138808);
    color: #000;
}

.gst-container h2 {
    text-align: center;
    color: #000080;
}

.gst-container form label {
    display: block;
    margin: 10px 0 5px;
}

.gst-container form input,
.gst-container form select {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.gst-container form button {
    width: 100%;
    padding: 10px;
    background-color: #000080;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.gst-container form button:hover {
    background-color: #138808;
}

#gst-result {
    margin-top: 20px;
    text-align: center;
    font-size: 1.2em;
    color: #000080;
}