body {
    background-color: #212121;
    color: #ffffff;
    font-family: sans-serif;
    display: block;
    height: auto;
    padding: 20px;
}

.hidden {
    display: none !important;
}

input {
    display: block;
    width: 100%;
    margin: 10px 0;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid #555;
    background: #333;
    color: white;
    box-sizing: border-box;
}

button {
    width: 100%;
    margin-top: 10px;
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 15px;
    text-align: center;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
}

.error {
    color: #ff5252;
    margin-top: 10px;
}

.message {
    color: #4CAF50;
    margin-top: 10px;
}

.card {
    background: #333;
    padding: 15px;
    border-radius: 10px;
    margin-top: 20px;
}