pre {
    background: white;
    clear: both;
    color: #3aaebf;
    font-family: 'Inconsolata', monospace;
    hyphens: none;
    /*line-height: 2rem;*/
    min-width: 100%;
    position: relative;
    word-break: normal;
    border: 1px solid #787878;
    border-radius: 4px;
    size: 1rem;
}

pre[rel]::before {
    display: flex;
    padding-top: 0;
}

pre[rel]::before {
    left: auto;
    position: relative;
    top: auto;
    width: 30px;
}
pre[rel]::before {
    background: #999;
    color: #f1f8f9;
    content: attr(rel);
    left: 0;
    padding: 1px 0;
    position: absolute;
    text-indent: 15px;
    top: 0;
    height: 100%;
    writing-mode: vertical-lr;
}

pre[rel="HTML"]::before {
    background: #5add22;
}

pre[rel="C"]::before {
    background: #a8b9cc;
}

pre[rel="Makefile"]::before {
    background: #f57e27;
}

pre[rel="JS"]::before {
    background: #b64949;  
}

pre code {
    display: block;
    font-family: 'Inconsolata', monospace;
    padding-left:3rem;
    overflow-x: auto;
    white-space: pre;
}