zulip/web/styles/search.css

#searchbox {
    width: 100%;
    height: var(--header-height);

    .navbar-search {
        margin: 5.5px 0;
        border-radius: 5px;
        position: absolute;
    }

    .search_icon {
        text-decoration: none;
        padding: 0 7px;
        font-size: 17px;
        border: none;
        background-color: transparent;
        color: hsl(0deg 0% 0%);
        opacity: 0.5;
        cursor: default;

        &:active,
        &:focus {
            outline: none;
        }

        &:disabled {
            visibility: hidden;
        }
    }

    .search_close_button {
        width: 28px;
        height: 100%;
        background: none;
        border: none;
        opacity: 0.5;
        line-height: 0;
        border-radius: 4px;
        /* Leave room for the focus outline. */
        margin-right: 1px;

        &:focus {
            /* Reduce height to leave 1px on top and bottom for the outline. */
            height: calc(100% - 2px);
        }

        &:not(:focus-visible) {
            outline: none;
        }

        &:hover {
            opacity: 1;
        }

        &:disabled {
            visibility: hidden;
        }
    }

    .zulip-icon-close {
        font-size: 13px;
    }

    .navbar-search:not(.expanded) {
        right: 0;

        .search_close_button {
            display: none;
        }

        #searchbox-input-container {
            width: var(--search-box-width);
        }

        .search-input {
            border-radius: 5px;
            color: var(--color-text-search);

            box-shadow: none;
            cursor: pointer;
        }

        &:hover {
            cursor: pointer;

            @media (width >= $md_min) {
                box-shadow:
                    0 4px 20px var(--color-search-box-hover-shadow),
                    0 1px 5px var(--color-search-box-hover-shadow);
            }

            .search_icon {
                cursor: pointer;
            }
        }

        @media (width < $md_min) {
            .search-input {
                opacity: 0;
            }
        }

        @media (height < $short_navbar_cutoff_height) {
            #searchbox-input-container .search_icon {
                font-size: 18px;
            }
        }
    }

    .navbar-search.expanded {
        width: 100%;
        box-shadow:
            0 4px 20px var(--color-search-shadow-wide),
            0 1px 5px var(--color-search-shadow-tight);

        @media (width < $md_min) {
            /* 3px chosen so that the cursor clicks the search button
               and close button from the same position. */
            width: calc(100% - 3px);
            /* z-index to not see the gear icon underneath */
            z-index: 1;
        }
    }

    .typeahead.dropdown-menu {
        /* Match the typeahead's width to its parent container. */
        right: 0;
        top: 0;
        margin-top: 0;
        padding-top: 0;
        box-shadow: none;
        position: relative;
        width: 100%;
        background: var(--color-background-search);
        color: var(--color-text-search);

        border-width: 0;
        border-top-width: 1px;
        border-top-color: var(--color-search-dropdown-top-border);
        border-radius: 0 0 4px 4px;

        .active > a {
            background-color: var(--color-background-search-option-hover);
            background-image: none;
            color: var(--color-text-search-hover);
        }
    }

    .input-append {
        position: relative;
        width: 100%;
        margin-bottom: 0;
    }

    .search-input {
        /* Avoid massive inheritance chain on font-size. */
        font-size: var(--base-font-size-px);
        /* override bootstrap padding for input[type="text"] */
        padding: 0;
        border: none;
        outline: none;
        border-radius: 0;
        font-family: "Source Sans 3 VF", sans-serif;
        font-weight: 400;
        height: var(--search-box-height);
        /* override bootstrap min-height for input[type="text"] */
        min-height: var(--search-box-height);
        background: transparent;
        text-overflow: ellipsis;
        overflow: hidden;
        white-space: nowrap;
        flex-grow: 1;

        color: var(--color-text-search);

        &::placeholder {
            color: var(--color-text-search-placeholder);
        }
    }

    #searchbox-input-container {
        display: flex;
        align-items: center;
        /* override .input-append style from app_components.js */
        letter-spacing: normal;
        height: var(--search-box-height);
    }

    @media (width >= $md_min) {
        .navbar-search {
            background: var(--color-background-search);
        }

        .navbar-search:not(.expanded) {
            box-shadow: 0 0 2px var(--color-search-box-hover-shadow);
        }
    }

    @media (width < $md_min) {
        .navbar-search:not(.expanded) .search_icon:hover {
            opacity: 1;
        }

        .navbar-search.expanded {
            background: var(--color-background-search);
        }
    }

    @media (height < $short_navbar_cutoff_height) {
        #searchbox_form:not(.expanded) {
            margin: 0;
            /* Now that the header is shorter, the search box will take up the whole
               height (which looks weird), so add 2px of space above and below it.
               The extra pixel is to account for the header's bottom border (box shadow). */
            margin-top: 2px;
            height: calc(var(--header-height) - 5px);

            #searchbox-input-container {
                height: calc(var(--search-box-height) - 5px);
            }
        }

        /* It looks fine to fill the navbar when the typeahead is open. */
        #searchbox_form.expanded {
            margin-top: 0;
        }
    }

    @media (width < $sm_min) {
        #searchbox_form.expanded {
            position: fixed;
            left: 0;
            right: 9px;
            width: 100%;
            border-radius: 0;
            box-shadow: none;
            /* To be visible over `.left-sidebar-toggle-unreadcount` */
            z-index: 20;
        }
    }

    .typeahead-menu li a {
        padding: 3px 30px;
        /* Override white-space: nowrap from zulip.css */
        white-space: normal;

        .search_list_item .pill-container {
            margin-left: 5px;
        }

        .pill {
            align-items: baseline;
        }

        .pill-image {
            /* Add line-height equal to height to mimic baseline alignment. */
            line-height: 20px;
            align-self: center;
        }
    }

    /* Break really long words (unlikely to happen). */
    .search_list_item span {
        word-break: break-word;
    }
}