body {
    font-family: 'Courier New', Courier, monospace;
    margin: 0;
    background-color: #000;
}

* {
    box-sizing: border-box;
}

#container {
    max-width: 850px;
    margin: 0 auto;
    color: #f00;
}

#container a {
    font-weight: bold;
}

#header {
    width: 100%;
    font-size: 42px;
}

#flex {
    display: flex;
}

.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
}

main {
    padding: 12px;
}

h1 {
    font-size: 30px;
    text-align: center;
}

a {
    color: #f00;
    font-weight: 800;
}

footer {
    color: #f00;
    width: 100%;
    height: 40px;
    padding: 10px;
    text-align: center;
}