body {
    background-color: #111;
    color: #fff;
    font-family: sans-serif;
    padding: 20px;
}
.container {
    max-width: 700px;
    margin: auto;
}
input, select, textarea, button {
    width: 100%;
    margin: 10px 0;
    padding: 8px;
}
#btnEnviar {
    background-color: #28a745;
    color: white;
}
#btnTestProxy {
    background-color: #007bff;
    color: white;
}
#proxyStatus {
    margin-top: 10px;
}