body {
    font-family: Arial, sans-serif;
    background: #111;
    color: #fff;
    margin: 0;
    padding: 0;
}

header {
    text-align: center;
    background: #222;
    padding: 20px;
}

main {
    max-width: 800px;
    margin: 20px auto;
    padding: 10px;
}

section {
    margin-bottom: 30px;
}

div.user, div.history-item {
    padding: 8px;
    border-bottom: 1px solid #333;
}