diff --git a/web/modals/threads/sidebars/sidebar.react.js b/web/modals/threads/sidebars/sidebar.react.js
new file mode 100644
index 000000000..502d0e823
--- /dev/null
+++ b/web/modals/threads/sidebars/sidebar.react.js
@@ -0,0 +1,79 @@
+// @flow
+
+import * as React from 'react';
+
+import type { ChatThreadItem } from 'lib/selectors/chat-selectors';
+import { getMessagePreview } from 'lib/shared/message-utils';
+import { shortAbsoluteDate } from 'lib/utils/date-utils';
+
+import { getDefaultTextMessageRules } from '../../../markdown/rules.react';
+import { useSelector } from '../../../redux/redux-utils';
+import { useOnClickThread } from '../../../selectors/nav-selectors';
+import { useModalContext } from '../../modal-provider.react';
+import css from './sidebars-modal.css';
+
+type Props = {
+  +sidebar: ChatThreadItem,
+  +isLastItem?: boolean,
+};
+
+function Sidebar(props: Props): React.Node {
+  const { sidebar, isLastItem } = props;
+  const { threadInfo, lastUpdatedTime, mostRecentMessageInfo } = sidebar;
+
+  const timeZone = useSelector(state => state.timeZone);
+  const { popModal } = useModalContext();
+
+  const navigateToThread = useOnClickThread(threadInfo);
+
+  const onClickThread = React.useCallback(
+    event => {
+      popModal();
+      navigateToThread(event);
+    },
+    [popModal, navigateToThread],
+  );
+
+  const lastActivity = React.useMemo(
+    () => shortAbsoluteDate(lastUpdatedTime, timeZone),
+    [lastUpdatedTime, timeZone],
+  );
+
+  const lastMessage = React.useMemo(() => {
+    if (!mostRecentMessageInfo) {
+      return <div className={css.noMessage}>No messages</div>;
+    }
+    const { message, username } = getMessagePreview(
+      mostRecentMessageInfo,
+      threadInfo,
+      getDefaultTextMessageRules().simpleMarkdownRules,
+    );
+    const previewText = username ? `${username}: ${message}` : message;
+    return (
+      <>
+        <div className={css.longTextEllipsis}>{previewText}</div>
+        <div className={css.lastActivity}>{lastActivity}</div>
+      </>
+    );
+  }, [lastActivity, mostRecentMessageInfo, threadInfo]);
+
+  return (
+    <button className={css.sidebarContainer} onClick={onClickThread}>
+      <img
+        className={css.sidebarArrow}
+        src={
+          isLastItem
+            ? 'images/arrow_sidebar_last.svg'
+            : 'images/arrow_sidebar.svg'
+        }
+        alt="sidebar arrow"
+      />
+      <div className={css.sidebarInfo}>
+        <div className={css.longTextEllipsis}>{threadInfo.name}</div>
+        <div className={css.lastMessage}>{lastMessage}</div>
+      </div>
+    </button>
+  );
+}
+
+export default Sidebar;
diff --git a/web/modals/threads/sidebars/sidebars-modal.css b/web/modals/threads/sidebars/sidebars-modal.css
new file mode 100644
index 000000000..ed57f9f95
--- /dev/null
+++ b/web/modals/threads/sidebars/sidebars-modal.css
@@ -0,0 +1,52 @@
+button.sidebarContainer {
+  cursor: pointer;
+  display: flex;
+  padding: 0 16px;
+  column-gap: 8px;
+  align-items: flex-start;
+  width: 100%;
+  border: none;
+  font-size: inherit;
+  text-align: inherit;
+  line-height: inherit;
+  color: inherit;
+  background: inherit;
+}
+
+button.sidebarContainer:hover {
+  color: var(--sidebars-modal-color-hover);
+}
+
+div.sidebarInfo {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+  padding: 8px 0;
+}
+
+div.longTextEllipsis {
+  text-overflow: ellipsis;
+  overflow: hidden;
+  white-space: nowrap;
+}
+
+div.lastMessage {
+  display: flex;
+  justify-content: space-between;
+  column-gap: 14px;
+}
+
+div.noMessage {
+  text-align: center;
+  font-style: italic;
+}
+
+div.lastActivity {
+  white-space: nowrap;
+}
+
+img.sidebarArrow {
+  position: relative;
+  top: -12px;
+}
diff --git a/web/theme.css b/web/theme.css
index 6010217d5..d1c661443 100644
--- a/web/theme.css
+++ b/web/theme.css
@@ -1,177 +1,178 @@
 :root {
   /* Never use color values defined here directly in CSS. Add color variables to "Color Theme" below
 
      The reason we never use color values defined here directly in CSS is
 
       1. It makes changing themes from light / dark / user generated impossible.
       2. Gives the programmer context into the color being used.
       3. If our color system changes it's much easier to change color values in one place.
 
      Add a color value to the theme below, and then use it in your CSS.
      naming convention:
      - bg: background.
      - fg: foreground.
      - color: text-color
    */
   --shades-white-100: #ffffff;
   --shades-white-90: #f5f5f5;
   --shades-white-80: #ebebeb;
   --shades-white-70: #e0e0e0;
   --shades-white-60: #cccccc;
 
   --shades-black-100: #0a0a0a;
   --shades-black-90: #1f1f1f;
   --shades-black-80: #404040;
   --shades-black-70: #666666;
   --shades-black-60: #808080;
 
   --violet-dark-100: #7e57c2;
   --violet-dark-80: #6d49ab;
   --violet-dark-60: #563894;
   --violet-dark-40: #44297a;
   --violet-dark-20: #331f5c;
 
   --violet-light-100: #ae94db;
   --violet-light-80: #b9a4df;
   --violet-light-60: #d3c6ec;
   --violet-light-40: #e8e0f5;
   --violet-light-20: #f3f0fa;
 
   --success-light-10: #d5f6e3;
   --success-light-50: #6cdf9c;
   --success-primary: #00c853;
   --success-dark-50: #029841;
   --success-dark-90: #034920;
 
   --error-light-10: #feebe6;
   --error-light-50: #f9947b;
   --error-primary: #f53100;
   --error-dark-50: #b62602;
   --error-dark-90: #4f1203;
 
   --bg: var(--shades-black-100);
   --fg: var(--shades-white-100);
   --color-disabled: var(--shades-black-60);
   --text-input-bg: var(--shades-black-80);
   --text-input-color: var(--shades-white-60);
   --text-input-placeholder: var(--shades-white-60);
   --border: var(--shades-black-80);
   --error: var(--error-primary);
   --success: var(--success-dark-50);
 
   /* Color Theme */
   --btn-bg-primary: var(--violet-dark-100);
   --btn-bg-primary-hover: var(--violet-dark-80);
   --btn-bg-primary-disabled: var(--shades-black-80);
   --btn-bg-secondary: var(--shades-black-90);
   --btn-bg-secondary-hover: var(--shades-black-80);
   --btn-bg-secondary-disabled: var(--shades-black-90);
   --btn-bg-danger: var(--error-primary);
   --btn-bg-danger-hover: var(--error-dark-50);
   --btn-bg-danger-disabled: var(--shades-black-80);
   --btn-disabled-color: var(--shades-black-60);
   --chat-bg: var(--violet-dark-80);
   --chat-confirmation-icon: var(--violet-dark-100);
   --keyserver-selection: var(--violet-dark-60);
   --thread-selection: var(--violet-light-80);
   --thread-hover-bg: var(--shades-black-90);
   --thread-active-bg: var(--shades-black-80);
   --chat-timestamp-color: var(--shades-black-60);
   --tool-tip-bg: var(--shades-black-80);
   --tool-tip-color: var(--shades-white-60);
   --border-color: var(--shades-black-80);
   --calendar-chevron: var(--shades-black-60);
   --calendar-day-bg: var(--shades-black-60);
   --calendar-day-selected-color: var(--violet-dark-80);
   --community-bg: var(--shades-black-90);
   --community-settings-selected: var(--violet-dark-60);
   --unread-bg: var(--error-primary);
   --settings-btn-bg: var(--violet-dark-100);
   --modal-bg: var(--shades-black-90);
   --modal-fg: var(--shades-white-60);
   --join-bg: var(--shades-black-90);
   --help-color: var(--shades-black-60);
   --breadcrumb-color: var(--shades-white-60);
   --breadcrumb-color-unread: var(--shades-white-60);
   --btn-secondary-border: var(--shades-black-60);
   --thread-color-read: var(--shades-black-60);
   --thread-from-color-read: var(--shades-black-80);
   --thread-last-message-color-read: var(--shades-black-60);
   --relationship-button-green: var(--success-dark-50);
   --relationship-button-red: var(--error-primary);
   --relationship-button-text: var(--fg);
   --disconnected-bar-alert-bg: var(--error-dark-50);
   --disconnected-bar-alert-color: var(--shades-white-100);
   --disconnected-bar-connecting-bg: var(--shades-white-70);
   --disconnected-bar-connecting-color: var(--shades-black-100);
   --permission-color: var(--shades-white-60);
   --thread-top-bar-color: var(--shades-white-100);
   --thread-top-bar-menu-color: var(--shades-white-70);
   --thread-ancestor-keyserver-border: var(--shades-black-70);
   --thread-ancestor-color-light: var(--shades-white-70);
   --thread-ancestor-color-dark: var(--shades-black-100);
   --thread-ancestor-separator-color: var(--shades-white-60);
   --text-message-default-background: var(--shades-black-80);
   --message-action-tooltip-bg: var(--shades-black-90);
   --menu-bg: var(--shades-black-90);
   --menu-bg-light: var(--shades-black-80);
   --menu-separator-color: var(--shades-black-80);
   --menu-color: var(--shades-black-60);
   --menu-color-light: var(--shades-white-60);
   --menu-color-hover: var(--shades-white-100);
   --menu-color-dangerous: var(--error-primary);
   --menu-color-dangerous-hover: var(--error-light-50);
   --app-list-icon-read-only-color: var(--shades-black-60);
   --app-list-icon-enabled-color: var(--success-primary);
   --app-list-icon-disabled-color: var(--shades-white-80);
   --account-settings-label: var(--shades-black-60);
   --account-button-color: var(--violet-dark-100);
   --chat-thread-list-color-active: var(--shades-white-60);
   --chat-thread-list-menu-color: var(--shades-white-60);
   --chat-thread-list-menu-bg: var(--shades-black-80);
   --chat-thread-list-menu-active-color: var(--shades-white-60);
   --chat-thread-list-menu-active-bg: var(--shades-black-90);
   --search-clear-color: var(--shades-white-100);
   --search-clear-bg: var(--shades-black-70);
   --search-input-color: var(--shades-white-100);
   --search-input-placeholder: var(--shades-black-60);
   --search-icon-color: var(--shades-black-60);
   --tabs-header-active-color: var(--shades-white-100);
   --tabs-header-active-border: var(--violet-light-100);
   --tabs-header-background-color: var(--shades-black-60);
   --tabs-header-background-border: var(--shades-black-80);
   --tabs-header-background-color-hover: var(--shades-white-80);
   --tabs-header-background-border-hover: var(--shades-black-70);
   --members-modal-member-text: var(--shades-black-60);
   --members-modal-member-text-hover: var(--shades-white-100);
   --label-default-bg: var(--violet-dark-80);
   --label-default-color: var(--shades-white-80);
   --subchannels-modal-color: var(--shades-black-60);
   --subchannels-modal-color-hover: var(--shades-white-100);
   --color-selector-active-bg: var(--shades-black-80);
   --relationship-modal-color: var(--shades-black-60);
   --arrow-extension-color: var(--shades-black-60);
   --modal-close-color: var(--shades-black-60);
   --modal-close-color-hover: var(--shades-white-100);
   --add-members-group-header-color: var(--shades-black-60);
   --add-members-item-color: var(--shades-black-60);
   --add-members-item-color-hover: var(--shades-white-100);
   --add-members-item-disabled-color: var(--shades-black-80);
   --add-members-item-disabled-color-hover: var(--shades-black-60);
   --add-members-remove-pending-color: var(--error-primary);
   --add-members-remove-pending-color-hover: var(--error-light-50);
   --radio-border: var(--shades-black-70);
   --radio-color: var(--shades-white-60);
   --notification-settings-option-selected-bg: var(--shades-black-80);
   --notification-settings-option-title-color: var(--shades-white-90);
   --notification-settings-option-color: var(--shades-white-60);
   --notification-settings-option-invalid-color: var(--shades-black-80);
   --notification-settings-option-invalid-selected-color: var(--shades-black-60);
   --danger-zone-subheading-color: var(--shades-white-60);
   --danger-zone-explanation-color: var(--shades-black-60);
   --thread-creation-search-container-bg: var(--shades-black-90);
   --thread-creation-close-search-color: var(--shades-black-60);
   --thread-creation-search-item-bg-hover: var(--shades-black-80);
   --thread-creation-search-item-info-color: var(--shades-black-60);
   --chat-message-list-active-border: #5989d6;
+  --sidebars-modal-color-hover: var(--shades-white-100);
 }