body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 1em;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    margin: 0;
}

.login-button {
    background-color: #ffffff;
    color: #4CAF50;
    border: none;
    padding: 0.5em 1em;
    cursor: pointer;
}

main {
    padding: 2em;
}

section {
    margin-bottom: 2em;
}

form {
    display: flex;
    flex-direction: column;
}

form label, form input, form select, form textarea, form button {
    margin-bottom: 1em;
}

form input, form select, form textarea, form button {
    padding: 0.5em;
}

form button {
    background-color: #4CAF50;
    color: rgb(255, 255, 255);
    border: none;
    cursor: pointer;
}

.qr-code {
    text-align: center;
}

.qr-code img.center {
    display: block;
    margin: 0 auto;
}

.rules {
    max-width: 600px;
    margin: 0 auto;
}

.rules h2 {
    text-align: center;
}

.rules ol {
    padding-left: 20px;
}

footer {
    text-align: center;
    padding: 1em;
    background-color: #f1f1f1;
}

footer a {
    color: #4CAF50;
    text-decoration: none;
}