upstream-zulip/web/styles/tooltips.css

[data-tippy-root] {
    /* Since tooltip elements are sometimes inside elements
     * which have different font-family, we force font-family
     * for tooltips here.
     */
    font-family: "Source Sans 3 VF", sans-serif !important;
    overflow-wrap: anywhere;
    /* Contains stylistic variant of upper-case character "I" in Source Sans 3 */
    font-feature-settings: "ss01" on;

    /* Affects all tippy tooltips not using any theme. */
    .tippy-box:not([data-theme]) {
        background: var(--color-background-tippy-box);
        border-radius: 5px;
        /* 14px at 14px/1em */
        font-size: var(--base-font-size-px);
        /* 25px at 14px/1em */
        min-height: 1.7857em;
        box-sizing: border-box;

        .tippy-content {
            box-sizing: inherit;
            display: flex;
            align-items: center;
            padding: 5px 10px;
            /* 14px at 14px/1em */
            font-size: var(--base-font-size-px);
            /* 20px at 14px/1em */
            line-height: 1.4286em;
            /* Don't inherit font-weight when
               a Tippy attaches to a parent */
            font-weight: normal;
            color: hsl(0deg 0% 100%);
        }

        .tippy-arrow::before {
            /* This affects the arrow for tooltips and doesn't have any impact on arrows for popovers.
             * The transform property scales down the size of the arrow, giving it a thinner appearance.
             * https://atomiks.github.io/tippyjs/v6/themes/#changing-the-arrow-size
             */
            transform: scale(0.75);
        }

        .tooltip-inner-content {
            /* 17px at 14px/1em */
            line-height: 1.2143em;
        }

        &[data-placement^="top"] > .tippy-arrow::before {
            border-top-color: var(--color-background-tippy-box);
        }

        &[data-placement^="bottom"] > .tippy-arrow::before {
            border-bottom-color: var(--color-background-tippy-box);
        }

        &[data-placement^="left"] > .tippy-arrow::before {
            border-left-color: var(--color-background-tippy-box);
        }

        &[data-placement^="right"] > .tippy-arrow::before {
            border-right-color: var(--color-background-tippy-box);
        }
    }

    .tippy-arrow::before {
        /* `.tippy-arrow:before` element sometimes
         * inherits the height of the parent, we
         * don't want any height here since we
         * want it to remain an triangle.
         * The bug was only found in Firefox.
         */
        height: 0 !important;
    }
    /* If the text in the tooltips stretches to multiple lines,
     * we want the lines to be left-indented and not right-indented
     * by default.
     */
    text-align: left;

    .tooltip-hotkey-hints {
        box-sizing: inherit;
        display: flex;
        align-self: flex-start;
        margin: 0 -5px 0 10px;
        gap: 4px;
    }

    & span.tooltip-hotkey-hint {
        border: 1px solid hsl(225deg 100% 84%);
        border-radius: 3px;
        color: hsl(225deg 100% 84%);
        padding: 0 5px;
        text-align: center;
        white-space: nowrap;
    }

    .view-channel-tooltip {
        /* This is needed so that the hotkey hints do not
        move to a new line after "View #{channel_name}". */
        display: inline-flex;

        .view-channel-text {
            word-break: break-all;
        }
    }

    /* If the reference of the tooltip is went offscreen while scrolling,
       the tooltip will be visible until the scrolling stops. Popper adds
       `data-reference-hidden` attribute to those tooltips whole reference is
       hidden. Since tooltips have `absolute` position, they can occupy scroll
       space offscreen and cause document to have the wrong scroll height.
       Setting `display: none` makes sure it doesn't occupy any offscreen space.

       NOTE: This data attribute has changed each time in the past 3 releases and
       if we upgrade tippy from v6, we should check if this attribute is still valid.

       See https://github.com/atomiks/tippyjs/issues/555 for some discussion on this.
    */
    [data-reference-hidden]:not(.show-when-reference-hidden) {
        display: none;
    }
}