body {
    background-color: #1a073e;
    font-size: medium;
    text-align: center;
    color: #FFF;
    margin: 0;
    padding: 0;
}

.aa {
    color: #FF0;
    font-size: xx-large;
}

.aa {
    color: #F00;
}

.aa strong {
    color: #FF0;
}

.aaa {
    font-size: xx-large;
    color: #F00;
}

.bb {
    font-size: large;
    color: #F0F;
}

header {
    display: none;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}