body {
    font-family: Arial, sans-serif;
    margin: 20px;
}

h1 {
    color: #333;
}

ul {
    list-style-type: none;
    padding: 0;
}

li {
    margin: 10px 0;
    font-size: 18px;
}

.online {
    color: green;
}

.offline {
    color: red;
}