abbr[title] {
        position: relative;

        /* ensure consistent styling across browsers */
        text-decoration: underline dotted;
    }

    abbr[title]:hover::after,
    abbr[title]:focus::after {
        content: attr(title);

        /* position tooltip like the native one */
        position: relative;
        left: 0;
        bottom: 2em;
        width: auto;
        white-space: nowrap;

        /* style tooltip */
        background-color: yellow;
        color: blue;
        border-radius: 3px;
        box-shadow: 1px 1px 5px 0 rgba(0, 0, 0, 0.4);
        font-size: 14px;
        padding: 3px 5px;
    }