upstream-zulip/web/styles/message_edit_history.css

.message-edit-history-container {
    .header-body {
        display: flex;
        align-items: center;
        flex-direction: row;
        justify-content: space-between;
        gap: 5px;

        @media (width < $lg_min) {
            display: block;
        }
    }

    .message_edit_history_content {
        .highlight_text_inserted {
            color: var(--color-message-edit-history-text-inserted);
            background-color: var(
                --color-message-edit-history-background-inserted
            );
        }

        .highlight_text_deleted {
            color: var(--color-message-edit-history-text-deleted);
            background-color: var(
                --color-message-edit-history-background-deleted
            );
            text-decoration: line-through;
            word-break: break-all;
        }
    }

    .messagebox-content {
        display: block !important;

        .message_content {
            cursor: default !important;
        }
    }

    #message-history-error {
        /*
        styles are based on .model_content
        see web/styles/modal.css
        */
        font-size: 1rem;
        display: none;
        margin: 10px;
    }

    .overlay_loading_indicator_style {
        width: 100% !important;
        height: 100% !important;
        display: flex;
        justify-content: center;
        align-items: center;
    }
}

#message-history-overlay
    .message-edit-history-container
    .message_edit_history_content {
    /* We need to use different color for links to distinguish
       them from normal text and have enough contrast so that they
       are visible clearly. */
    .highlight_text_inserted,
    .highlight_text_deleted {
        > a {
            color: light-dark(
                var(--color-markdown-link),
                hsl(200.27deg 100% 85.49%)
            );
        }
    }

    /* Show `Link:` text of media beside it
       to clarify click area for opening media
       in new tab vs in lightbox. */
    .highlight_text_inserted:has(.media-anchor-element .media-image-element),
    .highlight_text_deleted:has(.media-anchor-element .media-image-element) {
        > .media-anchor-element {
            display: flex;
            overflow-wrap: anywhere;

            > .media-image-element {
                flex-grow: 1;
                flex-shrink: 0;
            }
        }

        @media (width < $sm_min) {
            > .media-anchor-element {
                flex-direction: column;
            }
        }
    }
}