.center {text-align: center}
        .sr-only {
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            border: 0;
        }
        .strong {font-weight: bold;}
        .italic {font-style: italic;}
        .serif {font-family: serif;}
        .sans {font-family: sans-serif;}
        .big {font-size: 1.5em;}
        .small {font-size: .75em;}
        .offset {
            margin: 1em;
            padding: 1.5em;
            border: black 1px solid;
        }
        img {
            padding: 0;
            margin: 0;
            max-width: 100%;
            max-height: 100%;
            column-count: 1;
            break-inside: avoid;
            oeb-column-number: 1;
        }
        p {
            text-indent: 4em;
        }