gitbook/packages/gitbook-plugin-theme-default/less/Tooltipped.less

.GitBook-Tooltipped {
    display: inline-block;
    position: relative;

    &:hover, &.Tooltipped-o {
        &:after {
            line-height: 1em;
            background: @tooltip-background;
            border-radius: @tooltip-radius;
            bottom: auto;
            top: ~"calc(100% + 10px)";
            color: @tooltip-color;
            content: attr(aria-label);
            display: block;
            left: 50%;
            padding: 5px 5px;
            position: absolute;
            white-space: nowrap;
            z-index: @zindex-tooltip;
            font-size: 13px;
            text-transform: none;
            font-weight: @font-size-base;
            pointer-events: none;
            transform: translateX(-50%);
        }

        &:before {
            border: solid;
            border-color: @tooltip-background transparent;
            bottom:auto;
            top: ~"calc(100% + 5px)";
            border-width: 0px 5px 5px 5px;
            content: "";
            display: block;
            left: 50%;
            position: absolute;
            z-index: @zindex-tooltip+1;
            transform: translateX(-50%);
        }
    }

    .north() {
        &:after {
            top: auto;
            bottom: ~"calc(100% + 10px)";
            transform: translateX(0%);
        }
        &:before {
            top: auto;
            border-width: 5px 5px 0px 5px;
            bottom: ~"calc(100% + 5px)";
            transform: translateX(0%);
        }
    }
    .west() {
        &:after {
            left: auto;
            right: 5px;
            transform: translateX(0%);
        }
        &:before {
            left: auto;
            right: 10px;
            transform: translateX(0%);
        }
    }
    .east() {
        &:after {
            right: auto;
            left: 5px;
            transform: translateX(0%);
        }
        &:before {
            right: auto;
            left: 10px;
            transform: translateX(0%);
        }
    }

    &.Tooltipped-e {
        .east()
    }

    &.Tooltipped-n {
        .north();
    }

    &.Tooltipped-ne {
        .north();
        .east();
    }

    &.Tooltipped-nw {
        .north();
        .west();
    }
    &.Tooltipped-sw, &.Tooltipped-w {
        .west();
    }
}