diff --git a/web/chat/tooltip-utils.js b/web/chat/tooltip-utils.js
index 2d4ab7f22..8a9cc962c 100644
--- a/web/chat/tooltip-utils.js
+++ b/web/chat/tooltip-utils.js
@@ -1,177 +1,215 @@
 // @flow
 
 import * as React from 'react';
 
+import { calculateMaxTextWidth } from '../utils/text-utils';
+import {
+  tooltipButtonStyle,
+  tooltipLabelStyle,
+  tooltipStyle,
+} from './chat-constants';
 import type { PositionInfo } from './position-types';
 
 export const tooltipPositions = Object.freeze({
   LEFT: 'left',
   RIGHT: 'right',
   LEFT_BOTTOM: 'left-bottom',
   RIGHT_BOTTOM: 'right-bottom',
   LEFT_TOP: 'left-top',
   RIGHT_TOP: 'right-top',
   TOP: 'top',
   BOTTOM: 'bottom',
 });
 
 type TooltipSize = {
   +height: number,
   +width: number,
 };
 
 export type TooltipPositionStyle = {
   +xCoord: number,
   +yCoord: number,
   +verticalPosition: 'top' | 'bottom',
   +horizontalPosition: 'left' | 'right',
   +alignment: 'left' | 'center' | 'right',
 };
 
 export type TooltipPosition = $Values<typeof tooltipPositions>;
 
 export type MessageTooltipAction = {
   +label: string,
   +onClick: (SyntheticEvent<HTMLDivElement>) => mixed,
   +actionButtonContent: React.Node,
 };
 
 const sizeOfTooltipArrow = 10; // 7px arrow + 3px extra
 const appTopBarHeight = 65;
 
-// eslint-disable-next-line no-unused-vars
 const font =
-  '14px -apple-system, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", ' +
+  '14px "Inter", -apple-system, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", ' +
   '"Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", ui-sans-serif';
 
 type FindTooltipPositionArgs = {
   +sourcePositionInfo: PositionInfo,
   +tooltipSize: TooltipSize,
   +availablePositions: $ReadOnlyArray<TooltipPosition>,
   +defaultPosition: TooltipPosition,
   +preventDisplayingBelowSource?: boolean,
 };
 
 function findTooltipPosition({
   sourcePositionInfo,
   tooltipSize,
   availablePositions,
   defaultPosition,
   preventDisplayingBelowSource,
 }: FindTooltipPositionArgs): TooltipPosition {
   if (!window) {
     return defaultPosition;
   }
   const appContainerPositionInfo: PositionInfo = {
     height: window.innerHeight - appTopBarHeight,
     width: window.innerWidth,
     top: appTopBarHeight,
     bottom: window.innerHeight,
     left: 0,
     right: window.innerWidth,
   };
 
   const pointingTo = sourcePositionInfo;
   const {
     top: containerTop,
     left: containerLeft,
     right: containerRight,
     bottom: containerBottom,
   } = appContainerPositionInfo;
 
   const tooltipWidth = tooltipSize.width;
   const tooltipHeight = tooltipSize.height;
 
   const canBeDisplayedOnLeft = containerLeft + tooltipWidth <= pointingTo.left;
   const canBeDisplayedOnRight =
     tooltipWidth + pointingTo.right <= containerRight;
 
   const willCoverSidebarOnTopSideways =
     preventDisplayingBelowSource &&
     pointingTo.top + tooltipHeight > pointingTo.bottom;
 
   const canBeDisplayedOnTopSideways =
     pointingTo.top >= containerTop &&
     pointingTo.top + tooltipHeight <= containerBottom &&
     !willCoverSidebarOnTopSideways;
 
   const canBeDisplayedOnBottomSideways =
     pointingTo.bottom <= containerBottom &&
     pointingTo.bottom - tooltipHeight >= containerTop;
 
   const verticalCenterOfPointingTo = pointingTo.top + pointingTo.height / 2;
   const horizontalCenterOfPointingTo = pointingTo.left + pointingTo.width / 2;
 
   const willCoverSidebarInTheMiddleSideways =
     preventDisplayingBelowSource &&
     verticalCenterOfPointingTo + tooltipHeight / 2 > pointingTo.bottom;
 
   const canBeDisplayedInTheMiddleSideways =
     verticalCenterOfPointingTo - tooltipHeight / 2 >= containerTop &&
     verticalCenterOfPointingTo + tooltipHeight / 2 <= containerBottom &&
     !willCoverSidebarInTheMiddleSideways;
 
   const canBeDisplayedOnTop =
     pointingTo.top - tooltipHeight >= containerTop &&
     horizontalCenterOfPointingTo - tooltipWidth / 2 >= containerLeft &&
     horizontalCenterOfPointingTo + tooltipWidth / 2 <= containerRight;
 
   const canBeDisplayedOnBottom =
     pointingTo.bottom + tooltipHeight <= containerBottom &&
     horizontalCenterOfPointingTo - tooltipWidth / 2 >= containerLeft &&
     horizontalCenterOfPointingTo + tooltipWidth / 2 <= containerRight &&
     !preventDisplayingBelowSource;
 
   for (const tooltipPosition of availablePositions) {
     if (
       tooltipPosition === tooltipPositions.RIGHT &&
       canBeDisplayedOnRight &&
       canBeDisplayedInTheMiddleSideways
     ) {
       return tooltipPosition;
     } else if (
       tooltipPosition === tooltipPositions.RIGHT_BOTTOM &&
       canBeDisplayedOnRight &&
       canBeDisplayedOnBottomSideways
     ) {
       return tooltipPosition;
     } else if (
       tooltipPosition === tooltipPositions.LEFT &&
       canBeDisplayedOnLeft &&
       canBeDisplayedInTheMiddleSideways
     ) {
       return tooltipPosition;
     } else if (
       tooltipPosition === tooltipPositions.LEFT_BOTTOM &&
       canBeDisplayedOnLeft &&
       canBeDisplayedOnBottomSideways
     ) {
       return tooltipPosition;
     } else if (
       tooltipPosition === tooltipPositions.LEFT_TOP &&
       canBeDisplayedOnLeft &&
       canBeDisplayedOnTopSideways
     ) {
       return tooltipPosition;
     } else if (
       tooltipPosition === tooltipPositions.RIGHT_TOP &&
       canBeDisplayedOnRight &&
       canBeDisplayedOnTopSideways
     ) {
       return tooltipPosition;
     } else if (
       tooltipPosition === tooltipPositions.TOP &&
       canBeDisplayedOnTop
     ) {
       return tooltipPosition;
     } else if (
       tooltipPosition === tooltipPositions.BOTTOM &&
       canBeDisplayedOnBottom
     ) {
       return tooltipPosition;
     }
   }
   return defaultPosition;
 }
+type CalculateTooltipSizeArgs = {
+  +tooltipLabels: $ReadOnlyArray<string>,
+  +timestamp: string,
+};
+
+function calculateTooltipSize({
+  tooltipLabels,
+  timestamp,
+}: CalculateTooltipSizeArgs): {
+  +width: number,
+  +height: number,
+} {
+  const textWidth =
+    calculateMaxTextWidth([...tooltipLabels, timestamp], font) +
+    2 * tooltipLabelStyle.padding;
+  const buttonsWidth =
+    tooltipLabels.length *
+    (tooltipButtonStyle.width +
+      tooltipButtonStyle.paddingLeft +
+      tooltipButtonStyle.paddingRight);
+  const width =
+    Math.max(textWidth, buttonsWidth) +
+    tooltipStyle.paddingLeft +
+    tooltipStyle.paddingRight;
+  const height =
+    (tooltipLabelStyle.height + 2 * tooltipLabelStyle.padding) * 2 +
+    tooltipStyle.rowGap * 2 +
+    tooltipButtonStyle.height;
+  return {
+    width,
+    height,
+  };
+}
 
-export { findTooltipPosition, sizeOfTooltipArrow };
+export { findTooltipPosition, calculateTooltipSize, sizeOfTooltipArrow };