html, body {
    margin: 0;
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: flex-end;

    background: #adadad;
    padding: 12px 20px;
    border-bottom: 1px solid #ffffff;
}

.navbar a {
    color: #fff;
    text-decoration: none;
    padding: 6px 10px;
    border-radius: 6px;
    transition: background 0.2s;

    flex-shrink: 0;
}

.navbar a:hover {
    background: #333;
}

#game-area {
    flex: 1;
    overflow-y: auto;

    padding: 20px;
}