pre[class*='language-'] {
    position: relative;
}
pre[class*='language-'][data-information]::before {
    content: attr(data-information);
    color: black;
    background-color: #CFCFCF;
    display: inline-block;
    position: absolute;
    top: 0;
    right: 0;
    font-size: 0.9em;
    border-radius: 0 0 0 5px;
    padding: 0 0.5em;
    text-shadow: none;
}