diff --git a/src/MasterMix/MasterMix.test.tsx b/src/MasterMix/MasterMix.test.tsx
index c86c71bf..3856b064 100644
--- a/src/MasterMix/MasterMix.test.tsx
+++ b/src/MasterMix/MasterMix.test.tsx
@@ -1,6 +1,8 @@
 import { fireEvent, render, screen } from '@testing-library/react';
 import React from 'react';
 
+import { Provider } from '../Provider';
+
 import { MasterMixIngredient } from './types';
 
 import { MasterMix } from './index';
@@ -47,6 +49,26 @@ describe('MasterMix', () => {
     expect(screen.getByText('901.8 µl')).toBeInTheDocument();
   });
 
+  it('keeps each volume together with its unit', () => {
+    const keepWhitespace = (text: string) => text;
+
+    render(
+      <MasterMix
+        name="Test"
+        count={count}
+        ingredients={ingredients}
+        pipettingLoss={{ type: 'absolute', count: 2 }}
+      />,
+    );
+
+    expect(
+      screen.getByText('79.5\u00A0µl', { normalizer: keepWhitespace }),
+    ).toBeInTheDocument();
+    expect(
+      screen.getByText('901.8\u00A0µl', { normalizer: keepWhitespace }),
+    ).toBeInTheDocument();
+  });
+
   it('renders as reaction mix containing the master mix', () => {
     render(
       <MasterMix
@@ -158,4 +180,72 @@ describe('MasterMix', () => {
 
     expect(screen.queryAllByTitle('pipettiert')).toHaveLength(0);
   });
+
+  /* eslint-disable testing-library/no-container, testing-library/no-node-access -- antd wrappers have no role */
+  it('applies the given style', () => {
+    const { container } = render(
+      <Provider>
+        <MasterMix
+          name="Test"
+          mode="recipe"
+          ingredients={ingredients}
+          perReactionIngredients={[{ key: 5, title: 'cDNA', volume: 5 }]}
+          bodyPadding="12px"
+          headerSpacing="4px"
+          indentStepInPixels={12}
+        />
+      </Provider>,
+    );
+
+    expect(container.querySelector('.mll-ant-card-body')).toHaveStyle({
+      padding: '12px',
+    });
+    expect(container.querySelector('.mll-ant-card-head-title')).toHaveStyle({
+      paddingBlock: '4px',
+    });
+    expect(screen.getByText('Water').firstElementChild).toHaveStyle({
+      width: '24px',
+    });
+  });
+
+  it('adds pixels to a numeric header spacing', () => {
+    const { container } = render(
+      <Provider>
+        <MasterMix
+          name="Test"
+          mode="recipe"
+          ingredients={ingredients}
+          headerSpacing={4}
+        />
+      </Provider>,
+    );
+
+    expect(container.querySelector('.mll-ant-card-head-title')).toHaveStyle({
+      paddingBlock: '4px',
+    });
+  });
+
+  it('keeps the default style without style props', () => {
+    const { container } = render(
+      <Provider>
+        <MasterMix
+          name="Test"
+          mode="recipe"
+          ingredients={ingredients}
+          perReactionIngredients={[{ key: 5, title: 'cDNA', volume: 5 }]}
+        />
+      </Provider>,
+    );
+
+    expect(container.querySelector('.mll-ant-card-body')).not.toHaveAttribute(
+      'style',
+    );
+    expect(container.querySelector('.mll-ant-card-head-title')).not.toHaveStyle(
+      { paddingBlock: '4px' },
+    );
+    expect(screen.getByText('Water').firstElementChild).toHaveStyle({
+      width: '40px',
+    });
+  });
+  /* eslint-enable testing-library/no-container, testing-library/no-node-access */
 });
diff --git a/src/MasterMix/MasterMixRowName.tsx b/src/MasterMix/MasterMixRowName.tsx
index abb79887..4f6d16e8 100644
--- a/src/MasterMix/MasterMixRowName.tsx
+++ b/src/MasterMix/MasterMixRowName.tsx
@@ -1,8 +1,10 @@
 import React, { ReactNode } from 'react';
 import styled from 'styled-components';
 
+import { MasterMixStyle } from './types';
+
 const PIPETTED_MARK = '✓';
-const INDENT_STEP_IN_PIXELS = 20;
+const DEFAULT_INDENT_STEP_IN_PIXELS = 20;
 const MARK_GAP_IN_PIXELS = 5;
 
 /**
@@ -10,11 +12,11 @@ const MARK_GAP_IN_PIXELS = 5;
  * nor detaches from its row. The offset separates the mark from the name without moving
  * the name on any level.
  */
-const Indent = styled.span<{ $level: number }>`
+const Indent = styled.span<{ $widthInPixels: number }>`
   display: inline-block;
   position: relative;
   right: ${MARK_GAP_IN_PIXELS}px;
-  width: ${(props) => props.$level * INDENT_STEP_IN_PIXELS}px;
+  width: ${(props) => props.$widthInPixels}px;
   text-align: right;
   color: ${(props) => props.theme.successColor};
 `;
@@ -22,15 +24,20 @@ const Indent = styled.span<{ $level: number }>`
 export function MasterMixRowName({
   level,
   pipetted,
+  indentStepInPixels = DEFAULT_INDENT_STEP_IN_PIXELS,
   children,
 }: {
   level: number;
   pipetted: boolean;
+  indentStepInPixels?: MasterMixStyle['indentStepInPixels'];
   children: ReactNode;
 }) {
   return (
     <>
-      <Indent $level={level} title={pipetted ? 'pipettiert' : undefined}>
+      <Indent
+        $widthInPixels={level * indentStepInPixels}
+        title={pipetted ? 'pipettiert' : undefined}
+      >
         {pipetted ? PIPETTED_MARK : null}
       </Indent>
       {children}
diff --git a/src/MasterMix/MixTable.tsx b/src/MasterMix/MixTable.tsx
index fb0e7225..aef4132e 100644
--- a/src/MasterMix/MixTable.tsx
+++ b/src/MasterMix/MixTable.tsx
@@ -8,12 +8,18 @@ import {
 } from './VolumeTable';
 import { hasPerReactionIngredients } from './hasPerReactionIngredients';
 import { mixRows } from './mixRows';
-import { MasterMixTableRow, PipettingScaling, ReactionMix } from './types';
+import {
+  MasterMixStyle,
+  MasterMixTableRow,
+  PipettingScaling,
+  ReactionMix,
+} from './types';
 import { volumeColumns } from './volumeColumns';
 
-type MixTableProps = ReactionMix & {
-  scaling?: PipettingScaling;
-};
+type MixTableProps = ReactionMix &
+  Pick<MasterMixStyle, 'indentStepInPixels'> & {
+    scaling?: PipettingScaling;
+  };
 
 function rowClassName(
   record: MasterMixTableRow,
@@ -35,6 +41,7 @@ export function MixTable({
   ingredients,
   perReactionIngredients,
   scaling,
+  indentStepInPixels,
 }: MixTableProps) {
   const [pipettedKeys, setPipettedKeys] = useState<Array<string>>([]);
 
@@ -60,7 +67,12 @@ export function MixTable({
               }
             : {})
       }
-      columns={volumeColumns(scaling, pipettedKeys, withinReactionMix)}
+      columns={volumeColumns({
+        scaling,
+        pipettedKeys,
+        withinReactionMix,
+        indentStepInPixels,
+      })}
     />
   );
 }
diff --git a/src/MasterMix/index.stories.tsx b/src/MasterMix/index.stories.tsx
index 00e6645c..894fcf66 100644
--- a/src/MasterMix/index.stories.tsx
+++ b/src/MasterMix/index.stories.tsx
@@ -99,3 +99,20 @@ export function Recipe({ name, ingredients }: StoryProps): ReactElement {
     />
   );
 }
+
+export function NarrowCard(props: StoryProps): ReactElement {
+  return (
+    <div style={{ width: '400px' }}>
+      <MasterMix
+        name={props.name}
+        count={props.count}
+        ingredients={props.ingredients}
+        perReactionIngredients={PER_REACTION_INGREDIENTS}
+        pipettingLoss={{ type: 'factor', factor: props.lossValue }}
+        bodyPadding="12px"
+        headerSpacing="4px"
+        indentStepInPixels={12}
+      />
+    </div>
+  );
+}
diff --git a/src/MasterMix/index.tsx b/src/MasterMix/index.tsx
index e7391be3..a4e80a6b 100644
--- a/src/MasterMix/index.tsx
+++ b/src/MasterMix/index.tsx
@@ -1,5 +1,5 @@
 import React from 'react';
-import styled from 'styled-components';
+import styled, { css } from 'styled-components';
 
 import { Card } from '../Card';
 import { Typography } from '../Typography';
@@ -7,11 +7,12 @@ import { Typography } from '../Typography';
 import { MixTable } from './MixTable';
 import { hasPerReactionIngredients } from './hasPerReactionIngredients';
 import { MASTER_MIX_LABEL } from './mixRows';
-import { MasterMixProps } from './types';
+import { MasterMixProps, MasterMixStyle } from './types';
 
 export { reactionVolume } from './reactionVolume';
 export {
   MasterMixProps,
+  MasterMixStyle,
   MasterMixIngredient,
   ReactionMix,
   PipettingLoss,
@@ -25,7 +26,27 @@ export {
  * `max-width` on `.mll-ant-table-wrapper`.
  */
 const MixContent = styled.div`
-  max-width: 400px;
+  max-width: 480px;
+`;
+
+const MixCard = styled(Card)<{
+  $headerSpacing: MasterMixStyle['headerSpacing'];
+}>`
+  ${(props) =>
+    props.$headerSpacing != null &&
+    css`
+      .mll-ant-card-head {
+        min-height: 0;
+      }
+      .mll-ant-card-head-title {
+        padding-block: ${typeof props.$headerSpacing === 'number'
+          ? `${props.$headerSpacing}px`
+          : props.$headerSpacing};
+      }
+      .mll-ant-card-head-title .mll-ant-typography {
+        margin-bottom: 0;
+      }
+    `}
 `;
 
 /**
@@ -38,12 +59,17 @@ export function MasterMix({
   pipettingLoss,
   ingredients,
   perReactionIngredients,
+  bodyPadding,
+  headerSpacing,
+  indentStepInPixels,
 }: MasterMixProps) {
   /** Keyed on the scaling data itself, so a caller without types degrades to the recipe. */
   const scaling = pipettingLoss != null ? { count, pipettingLoss } : undefined;
 
   return (
-    <Card
+    <MixCard
+      $headerSpacing={headerSpacing}
+      bodyStyle={bodyPadding != null ? { padding: bodyPadding } : undefined}
       title={
         <Typography.Title level={5}>
           {name}{' '}
@@ -58,8 +84,9 @@ export function MasterMix({
           ingredients={ingredients}
           perReactionIngredients={perReactionIngredients}
           scaling={scaling}
+          indentStepInPixels={indentStepInPixels}
         />
       </MixContent>
-    </Card>
+    </MixCard>
   );
 }
diff --git a/src/MasterMix/pipettingLossTableColumn.tsx b/src/MasterMix/pipettingLossTableColumn.tsx
index a634a6c2..55bc45c5 100644
--- a/src/MasterMix/pipettingLossTableColumn.tsx
+++ b/src/MasterMix/pipettingLossTableColumn.tsx
@@ -96,7 +96,7 @@ export function pipettingLossTableColumn(
           return <>–</>;
         case 'masterMixIngredient':
         case 'masterMixTotal':
-          return <>{totalVolume(record, args)} µl</>;
+          return <>{totalVolume(record, args)}&nbsp;µl</>;
       }
     },
   };
diff --git a/src/MasterMix/types.ts b/src/MasterMix/types.ts
index 1a909a87..fdcc76ba 100644
--- a/src/MasterMix/types.ts
+++ b/src/MasterMix/types.ts
@@ -1,6 +1,6 @@
 import { Modify } from '@mll-lab/js-utils';
 import { ColumnType } from 'antd/es/table';
-import { ReactNode } from 'react';
+import { CSSProperties, ReactNode } from 'react';
 
 export type MasterMixIngredient = {
   key: number;
@@ -31,9 +31,16 @@ export type RecipeMode = {
   pipettingLoss?: never;
 };
 
+export type MasterMixStyle = {
+  bodyPadding?: CSSProperties['padding'];
+  headerSpacing?: CSSProperties['paddingBlock'];
+  indentStepInPixels?: number;
+};
+
 export type MasterMixProps = {
   name: string;
 } & ReactionMix &
+  MasterMixStyle &
   (PipettingScaling | RecipeMode);
 
 export type PipettingLossAbsolute = { type: 'absolute'; count: number };
diff --git a/src/MasterMix/volumeColumns.tsx b/src/MasterMix/volumeColumns.tsx
index 31f49218..6fd89022 100644
--- a/src/MasterMix/volumeColumns.tsx
+++ b/src/MasterMix/volumeColumns.tsx
@@ -5,6 +5,7 @@ import { REFERENCE_VOLUME_CLASS } from './VolumeTable';
 import { indentLevel } from './indentLevel';
 import { pipettingLossTableColumn } from './pipettingLossTableColumn';
 import {
+  MasterMixStyle,
   MasterMixTableRow,
   PipettingLossTableColumn,
   PipettingScaling,
@@ -18,11 +19,17 @@ function belongsToMasterMix(record: MasterMixTableRow): boolean {
   );
 }
 
-export function volumeColumns(
-  scaling: PipettingScaling | undefined,
-  pipettedKeys: Array<string>,
-  withinReactionMix: boolean,
-): Array<PipettingLossTableColumn> {
+export function volumeColumns({
+  scaling,
+  pipettedKeys,
+  withinReactionMix,
+  indentStepInPixels,
+}: {
+  scaling: PipettingScaling | undefined;
+  pipettedKeys: Array<string>;
+  withinReactionMix: boolean;
+  indentStepInPixels: MasterMixStyle['indentStepInPixels'];
+}): Array<PipettingLossTableColumn> {
   return [
     {
       title: 'Name',
@@ -30,6 +37,7 @@ export function volumeColumns(
         <MasterMixRowName
           level={indentLevel(record, withinReactionMix)}
           pipetted={pipettedKeys.includes(record.key)}
+          indentStepInPixels={indentStepInPixels}
         >
           {record.title}
         </MasterMixRowName>
@@ -45,7 +53,7 @@ export function volumeColumns(
             : undefined,
       }),
       render: (_: unknown, record: MasterMixTableRow) => (
-        <>{record.volume.toFixed(1)} µl</>
+        <>{record.volume.toFixed(1)}&nbsp;µl</>
       ),
     },
     ...(scaling ? [pipettingLossTableColumn(scaling)] : []),