.wh_breadcrumb title,
.wh_side_toc .title {
    position: relative;
   /* display: inline-block;*/
}

.wh_breadcrumb .topicref .wh-tooltip,
.wh_side_toc .topicref .wh-tooltip {
    display: flex;
    align-items: baseline;
    visibility: hidden;
    background-color: #444;
    color: #fff;
    font-weight: normal;
    text-align: left;
    line-height: 1em;
    padding: 10px;
    margin: 4px;
    border-radius: .4em;
    min-width: 15em;
    min-height: 2em;
    position: absolute;
    z-index: 1;
    opacity: 0;
    transition: .5s opacity 1s;
}

.wh_breadcrumb .topicref .wh-tooltip .shortdesc,
.wh_side_toc .topicref .wh-tooltip .shortdesc {
    /* Remove the paragraph margin. */
    margin: 0;
}

.wh_breadcrumb .topicref .title:hover .wh-tooltip,
.wh_side_toc .topicref .title:hover .wh-tooltip {
    visibility: visible;
    opacity: 1;
}

/* Tooltip positioning. */

[data-tooltip-position="left"] .topicref .wh-tooltip {
    top: -0.5em;
    right: calc(100% + 1em);
}

[data-tooltip-position="right"] .topicref .wh-tooltip {
    top: -0.5em;
    left: calc(100% + .4em);
}

[data-tooltip-position="top"] .topicref .wh-tooltip {
    bottom: 100%;
}

[data-tooltip-position="bottom"] .topicref .wh-tooltip {
    top: 100%;
}

[data-tooltip-position="hidden"] .topicref .wh-tooltip {
    display:none;
}

/* Tooltip arrow. */

.wh_breadcrumb .topicref .wh-tooltip::before,
.wh_side_toc .topicref .wh-tooltip::before {
    content: " ";
    position: absolute;
    border: .4em solid transparent;
}

[data-tooltip-position="left"] .topicref .wh-tooltip::before {
    top: .8em;
    left: 100%;
    border-left-color: #444;
}

[data-tooltip-position="right"] .topicref .wh-tooltip::before {
    top: .8em;
    right: 100%;
    border-right-color: #444;
}

[data-tooltip-position="bottom"] .topicref .wh-tooltip::before {
    left: .8em;
    bottom: 100%;
    border-bottom-color: #444;
}

[data-tooltip-position="top"] .topicref .wh-tooltip::before {
    left: .8em;
    top: 100%;
    border-top-color: #444;
}