html {
    height: 100%;
    font-family: "Courier New", Courier, monospace;
    font-size: 14px;
}

body {
    height: 100%;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    color: black;
}

pre {
    margin: 0;
}

a {
    color: inherit;
    text-decoration: none;
}

a:hover, a:focus {
    text-decoration: underline;
    outline: none;
}

block::before {
    content: '█';
}

space::before {
    content: ' ';
}