diff --git a/src/apps/chat/components/Ephemerals.tsx b/src/apps/chat/components/Ephemerals.tsx
index 1ed297bfa..30a5ed24b 100644
--- a/src/apps/chat/components/Ephemerals.tsx
+++ b/src/apps/chat/components/Ephemerals.tsx
@@ -6,6 +6,7 @@ import { SxProps } from '@mui/joy/styles/types';
 import CloseIcon from '@mui/icons-material/Close';
 
 import { DConversationId, DEphemeral, useChatStore } from '~/common/state/store-chats';
+import { lineHeightChatText } from '~/common/app.theme';
 
 
 const StateLine = styled(Typography)(({ theme }) => ({
@@ -15,7 +16,7 @@ const StateLine = styled(Typography)(({ theme }) => ({
   fontSize: theme.fontSize.xs,
   fontFamily: theme.fontFamily.code,
   marginLeft: theme.spacing(1),
-  lineHeight: 2,
+  lineHeight: lineHeightChatText,
 }));
 
 function isPrimitive(value: any): boolean {
@@ -93,7 +94,7 @@ function EphemeralItem({ conversationId, ephemeral }: { conversationId: string,
 
       {/* Left pane (console) */}
       <Grid xs={12} md={ephemeral.state ? 6 : 12}>
-        <Typography fontSize='smaller' sx={{ overflowWrap: 'anywhere', whiteSpace: 'break-spaces', lineHeight: 1.75 }}>
+        <Typography fontSize='smaller' sx={{ overflowWrap: 'anywhere', whiteSpace: 'break-spaces', lineHeight: lineHeightChatText }}>
           {ephemeral.text}
         </Typography>
       </Grid>
diff --git a/src/apps/chat/components/composer/Composer.tsx b/src/apps/chat/components/composer/Composer.tsx
index d1e43f926..61a20c8c5 100644
--- a/src/apps/chat/components/composer/Composer.tsx
+++ b/src/apps/chat/components/composer/Composer.tsx
@@ -26,6 +26,7 @@ import { DConversationId, useChatStore } from '~/common/state/store-chats';
 import { SpeechResult, useSpeechRecognition } from '~/common/components/useSpeechRecognition';
 import { countModelTokens } from '~/common/util/token-counter';
 import { launchAppCall } from '~/common/app.routes';
+import { lineHeightTextarea } from '~/common/app.theme';
 import { playSoundUrl } from '~/common/util/audioUtils';
 import { supportsClipboardRead } from '~/common/util/clipboardUtils';
 import { useDebouncer } from '~/common/components/useDebouncer';
@@ -465,7 +466,7 @@ export function Composer(props: {
                     '&:focus-within': {
                       backgroundColor: 'background.popup',
                     },
-                    lineHeight: 1.75,
+                    lineHeight: lineHeightTextarea,
                   }} />
 
                 {tokenLimit > 0 && (tokensComposer > 0 || (tokensHistory + tokensReponseMax) > 0) && (
diff --git a/src/apps/chat/components/message/ChatMessage.tsx b/src/apps/chat/components/message/ChatMessage.tsx
index e1ea2b5e7..8d586f1d7 100644
--- a/src/apps/chat/components/message/ChatMessage.tsx
+++ b/src/apps/chat/components/message/ChatMessage.tsx
@@ -3,7 +3,7 @@ import TimeAgo from 'react-timeago';
 import { shallow } from 'zustand/shallow';
 import { cleanupEfficiency, Diff as TextDiff, makeDiff } from '@sanity/diff-match-patch';
 
-import { Avatar, Box, Button, CircularProgress, IconButton, ListDivider, ListItem, ListItemDecorator, MenuItem, Stack, Switch, Tooltip, Typography } from '@mui/joy';
+import { Avatar, Box, Button, CircularProgress, IconButton, ListDivider, ListItem, ListItemDecorator, MenuItem, Switch, Tooltip, Typography } from '@mui/joy';
 import { SxProps } from '@mui/joy/styles/types';
 import AccountTreeIcon from '@mui/icons-material/AccountTree';
 import ClearIcon from '@mui/icons-material/Clear';
@@ -29,7 +29,7 @@ import { KeyStroke } from '~/common/components/KeyStroke';
 import { Link } from '~/common/components/Link';
 import { SystemPurposeId, SystemPurposes } from '../../../../data';
 import { copyToClipboard } from '~/common/util/clipboardUtils';
-import { cssRainbowColorKeyframes } from '~/common/app.theme';
+import { cssRainbowColorKeyframes, lineHeightChatText } from '~/common/app.theme';
 import { prettyBaseModel } from '~/common/util/modelUtils';
 import { useUIPreferencesStore } from '~/common/state/store-ui';
 
@@ -409,15 +409,19 @@ export function ChatMessage(props: {
   // per-blocks css
   const blockSx: SxProps = {
     my: 'auto',
+    lineHeight: lineHeightChatText,
+  };
+  const typographySx: SxProps = {
+    lineHeight: lineHeightChatText,
   };
   const codeSx: SxProps = {
     // backgroundColor: fromAssistant ? 'background.level1' : 'background.level1',
     backgroundColor: props.codeBackground ? props.codeBackground : fromAssistant ? 'neutral.plainHoverBg' : 'primary.plainActiveBg',
     boxShadow: 'xs',
     fontFamily: 'code',
-    fontSize: '14px',
+    fontSize: '0.875rem',
     fontVariantLigatures: 'none',
-    lineHeight: 1.75,
+    lineHeight: lineHeightChatText,
     borderRadius: 'var(--joy-radius-sm)',
   };
 
@@ -482,7 +486,12 @@ export function ChatMessage(props: {
       {/* Edit / Blocks */}
       {isEditing
 
-        ? <InlineTextarea initialText={messageText} onEdit={handleTextEdited} sx={{ ...blockSx, lineHeight: 1.75, flexGrow: 1 }} />
+        ? <InlineTextarea
+          initialText={messageText} onEdit={handleTextEdited}
+          sx={{
+            ...blockSx,
+            flexGrow: 1,
+          }} />
 
         : <Box
           onContextMenu={(ENABLE_SELECTION_RIGHT_CLICK_MENU && props.onMessageEdit) ? event => handleMouseUp(event.nativeEvent) : undefined}
@@ -526,12 +535,12 @@ export function ChatMessage(props: {
                     : block.type === 'image'
                       ? <RenderImage key={'image-' + index} imageBlock={block} isFirst={!index} allowRunAgain={props.isBottom === true} onRunAgain={handleOpsConversationRestartFrom} />
                       : block.type === 'latex'
-                        ? <RenderLatex key={'latex-' + index} latexBlock={block} />
+                        ? <RenderLatex key={'latex-' + index} latexBlock={block} sx={typographySx} />
                         : block.type === 'diff'
-                          ? <RenderTextDiff key={'latex-' + index} diffBlock={block} />
+                          ? <RenderTextDiff key={'latex-' + index} diffBlock={block} sx={typographySx} />
                           : (renderMarkdown && props.noMarkdown !== true && !fromSystem && !(fromUser && block.content.startsWith('/')))
-                            ? <RenderMarkdown key={'text-md-' + index} textBlock={block} />
-                            : <RenderText key={'text-' + index} textBlock={block} />)}
+                            ? <RenderMarkdown key={'text-md-' + index} textBlock={block} sx={typographySx} />
+                            : <RenderText key={'text-' + index} textBlock={block} sx={typographySx} />)}
 
           {isCollapsed && (
             <Button variant='plain' color='neutral' onClick={handleUncollapse}>... expand ...</Button>
diff --git a/src/apps/chat/components/message/RenderLatex.tsx b/src/apps/chat/components/message/RenderLatex.tsx
index 8449bace3..fb3814c98 100644
--- a/src/apps/chat/components/message/RenderLatex.tsx
+++ b/src/apps/chat/components/message/RenderLatex.tsx
@@ -17,7 +17,6 @@ const RenderLatexDynamic = React.lazy(async () => {
 export const RenderLatex = ({ latexBlock, sx }: { latexBlock: LatexBlock; sx?: SxProps; }) =>
   <Box
     sx={{
-      lineHeight: 1.75,
       mx: 1.5,
       ...(sx || {}),
     }}>
diff --git a/src/apps/chat/components/message/RenderMarkdown.tsx b/src/apps/chat/components/message/RenderMarkdown.tsx
index 972fb951e..fddb8c331 100644
--- a/src/apps/chat/components/message/RenderMarkdown.tsx
+++ b/src/apps/chat/components/message/RenderMarkdown.tsx
@@ -1,15 +1,16 @@
 import * as React from 'react';
 
+import type { SxProps } from '@mui/joy/styles/types';
 import { Box, useTheme } from '@mui/joy';
 
-import { TextBlock } from './blocks';
+import type { TextBlock } from './blocks';
 
 
 // Dynamically import ReactMarkdown using React.lazy
 const ReactMarkdown = React.lazy(async () => {
   const [markdownModule, remarkGfmModule] = await Promise.all([
     import('react-markdown'),
-    import('remark-gfm')
+    import('remark-gfm'),
   ]);
 
   // Pass the dynamically imported remarkGfm as children
@@ -21,7 +22,7 @@ const ReactMarkdown = React.lazy(async () => {
 });
 
 
-export const RenderMarkdown = ({ textBlock }: { textBlock: TextBlock }) => {
+export const RenderMarkdown = (props: { textBlock: TextBlock, sx?: SxProps }) => {
   const theme = useTheme();
   return (
     <Box
@@ -30,13 +31,15 @@ export const RenderMarkdown = ({ textBlock }: { textBlock: TextBlock }) => {
         mx: '12px !important',                                // margin: 1.5 like other blocks
         '& table': { width: 'inherit !important' },           // un-break auto-width (tables have 'max-content', which overflows)
         '--color-canvas-default': 'transparent !important',   // remove the default background color
-        fontFamily: `inherit !important`,                     // use the default font family
-        lineHeight: '1.75 !important',                        // line-height: 1.75 like the text block
+        // NOTE: the following are not needed because the CSS is under our control, and we
+        //       disabled the redefintions there
+        // fontFamily: `inherit !important`,                  // use the default font family
+        ...(props.sx || {}),
       }}>
 
       {/* Using React.Suspense / React.Lazy loading this */}
       <React.Suspense fallback={<div>Loading...</div>}>
-        <ReactMarkdown>{textBlock.content}</ReactMarkdown>
+        <ReactMarkdown>{props.textBlock.content}</ReactMarkdown>
       </React.Suspense>
     </Box>
   );
diff --git a/src/apps/chat/components/message/RenderText.tsx b/src/apps/chat/components/message/RenderText.tsx
index 3fa7cd899..7bbacae8e 100644
--- a/src/apps/chat/components/message/RenderText.tsx
+++ b/src/apps/chat/components/message/RenderText.tsx
@@ -13,7 +13,6 @@ export const RenderText = ({ textBlock, sx }: { textBlock: TextBlock; sx?: SxPro
   return (
     <Typography
       sx={{
-        lineHeight: 1.75,
         mx: 1.5,
         display: 'flex', alignItems: 'baseline',
         overflowWrap: 'anywhere',
diff --git a/src/apps/chat/components/message/RenderTextDiff.tsx b/src/apps/chat/components/message/RenderTextDiff.tsx
index 54f66d3d0..1960465c3 100644
--- a/src/apps/chat/components/message/RenderTextDiff.tsx
+++ b/src/apps/chat/components/message/RenderTextDiff.tsx
@@ -38,14 +38,13 @@ export const RenderTextDiff = ({ diffBlock, sx }: { diffBlock: DiffBlock; sx?: S
   return (
     <Typography
       sx={{
-        lineHeight: 1.75,
         mx: 1.5,
         // display: 'flex', alignItems: 'baseline',
         overflowWrap: 'anywhere',
         whiteSpace: 'break-spaces',
-        ...(sx || {}),
         display: 'block',
         zIndex: 200,
+        ...(sx || {}),
       }}
     >
       {textDiffs.map(([op, text], index) =>
diff --git a/src/apps/chat/components/persona-selector/PersonaSelector.tsx b/src/apps/chat/components/persona-selector/PersonaSelector.tsx
index f0cbc906f..25bde5e14 100644
--- a/src/apps/chat/components/persona-selector/PersonaSelector.tsx
+++ b/src/apps/chat/components/persona-selector/PersonaSelector.tsx
@@ -7,6 +7,7 @@ import SearchIcon from '@mui/icons-material/Search';
 import TelegramIcon from '@mui/icons-material/Telegram';
 
 import { DConversationId, useChatStore } from '~/common/state/store-chats';
+import { lineHeightTextarea } from '~/common/app.theme';
 import { navigateToPersonas } from '~/common/app.routes';
 import { useUIPreferencesStore } from '~/common/state/store-ui';
 
@@ -268,7 +269,7 @@ export function PersonaSelector(props: { conversationId: DConversationId, runExa
               '&:focus-within': {
                 backgroundColor: 'background.popup',
               },
-              lineHeight: 1.75,
+              lineHeight: lineHeightTextarea,
               mt: 1,
             }} />
         )}
diff --git a/src/apps/personas/PersonaCreator.tsx b/src/apps/personas/PersonaCreator.tsx
index bbf0a22e1..7efa77f80 100644
--- a/src/apps/personas/PersonaCreator.tsx
+++ b/src/apps/personas/PersonaCreator.tsx
@@ -10,6 +10,7 @@ import { GoodModal } from '~/common/components/GoodModal';
 import { GoodTooltip } from '~/common/components/GoodTooltip';
 import { apiQuery } from '~/common/util/trpc.client';
 import { copyToClipboard } from '~/common/util/clipboardUtils';
+import { lineHeightChatText, lineHeightTextarea } from '~/common/app.theme';
 import { useFormRadioLlmType } from '~/common/components/forms/useFormRadioLlmType';
 
 import { LLMChainStep, useLLMChain } from './useLLMChain';
@@ -174,7 +175,7 @@ export function PersonaCreator() {
             '&:focus-within': {
               backgroundColor: 'background.popup',
             },
-            lineHeight: 1.75,
+            lineHeight: lineHeightTextarea,
             mb: 1.5,
           }}
         />
@@ -219,7 +220,7 @@ export function PersonaCreator() {
           <Alert variant='soft' color='success' sx={{ mb: 1 }}>
             You may now copy the text below and use it as Custom prompt!
           </Alert>
-          <Typography level='title-sm' sx={{ lineHeight: 1.75 }}>
+          <Typography level='title-sm' sx={{ lineHeight: lineHeightChatText }}>
             {chainOutput}
           </Typography>
         </CardContent>
diff --git a/src/common/app.theme.ts b/src/common/app.theme.ts
index dca579338..89d0e6cc5 100644
--- a/src/common/app.theme.ts
+++ b/src/common/app.theme.ts
@@ -146,6 +146,9 @@ export const themeBgApp = 'background.level1';
 export const themeBgAppDarker = 'background.level2';
 export const themeBgAppChatComposer = 'background.surface';
 
+export const lineHeightChatText = 1.75;
+export const lineHeightTextarea = 1.75;
+
 export const bodyFontClassName = inter.className;
 export const themeBreakpoints = appTheme.breakpoints.values;
 
diff --git a/src/modules/aifn/summarize/ContentReducer.tsx b/src/modules/aifn/summarize/ContentReducer.tsx
index 0049f118e..b589e2e69 100644
--- a/src/modules/aifn/summarize/ContentReducer.tsx
+++ b/src/modules/aifn/summarize/ContentReducer.tsx
@@ -11,6 +11,7 @@ import { FormLabelStart } from '~/common/components/forms/FormLabelStart';
 import { GoodModal } from '~/common/components/GoodModal';
 import { Section } from '~/common/components/Section';
 import { countModelTokens } from '~/common/util/token-counter';
+import { lineHeightTextarea } from '~/common/app.theme';
 
 import { summerizeToFitContextBudget } from './summerize';
 
@@ -141,8 +142,7 @@ export function ContentReducer(props: {
             minRows={4} maxRows={8}
             value={reducedText}
             sx={{
-              fontSize: '14px',
-              lineHeight: 1.75,
+              lineHeight: lineHeightTextarea,
             }} />
 
           <TokenBadgeMemo direct={reducedTokens} limit={props.tokenLimit} absoluteBottomRight />