diff --git a/src/app.tsx b/src/app.tsx
index f853ace..0cf6663 100644
--- a/src/app.tsx
+++ b/src/app.tsx
@@ -3,9 +3,14 @@ import queryString from 'query-string';
 import {useEffect, useState} from 'react';
 import {FormattedMessage, useIntl} from 'react-intl';
 import {Navigate, Route, Routes, useLocation, useNavigate} from 'react-router';
-import {Loader, Message, Portal, Tab} from 'semantic-ui-react';
+import {
+  Loader,
+  Message,
+  Portal,
+  SidebarPushable,
+  SidebarPusher,
+} from 'semantic-ui-react';
 import {IndiInfo} from 'topola';
-import {Changelog} from './changelog';
 import {
   Chart,
   ChartType,
@@ -14,15 +19,6 @@ import {
   downloadSvg,
   printChart,
 } from './chart';
-import {
-  argsToConfig,
-  Config,
-  ConfigPanel,
-  configToArgs,
-  DEFALUT_CONFIG,
-  Ids,
-  Sex,
-} from './config';
 import {DataSourceEnum, SourceSelection} from './datasource/data_source';
 import {EmbeddedDataSource, EmbeddedSourceSpec} from './datasource/embedded';
 import {
@@ -38,14 +34,21 @@ import {
   WikiTreeDataSource,
   WikiTreeSourceSpec,
 } from './datasource/wikitree';
-import {Details} from './details/details';
 import {DonatsoChart} from './donatso-chart';
 import {Intro} from './intro';
 import {TopBar} from './menu/top_bar';
+import {
+  argsToConfig,
+  Config,
+  configToArgs,
+  DEFALUT_CONFIG,
+  Ids,
+  Sex,
+} from './sidepanel/config/config';
+import {SidePanel} from './sidepanel/side-panel';
 import {analyticsEvent} from './util/analytics';
 import {getI18nMessage} from './util/error_i18n';
 import {idToIndiMap, TopolaData} from './util/gedcom_util';
-import {Media} from './util/media';
 
 /**
  * Load GEDCOM URL from VITE_STATIC_URL environment variable.
@@ -241,7 +244,7 @@ export function App() {
     }
   }
 
-  function toggleDetails(config: Config, data: TopolaData | undefined) {
+  function updateChartWithConfig(config: Config, data: TopolaData | undefined) {
     if (data === undefined) {
       return;
     }
@@ -254,6 +257,14 @@ export function App() {
     });
   }
 
+  function onToggleSidePanel() {
+    const newShowSidePanel = !showSidePanel;
+    setShowSidePanel(newShowSidePanel);
+    updateUrl({
+      sidePanel: newShowSidePanel ? 'true' : 'false',
+    });
+  }
+
   /** Sets error message after data load failure. */
   function setErrorMessage(message: string) {
     setError(message);
@@ -362,7 +373,7 @@ export function App() {
           const data = await loadData(args.sourceSpec, args.selection);
           // Set state with data.
           setData(data);
-          toggleDetails(args.config, data);
+          updateChartWithConfig(args.config, data);
           setShowSidePanel(args.showSidePanel);
           setState(AppState.SHOWING_CHART);
         } catch (error: any) {
@@ -510,33 +521,6 @@ export function App() {
       case AppState.SHOWING_CHART:
       case AppState.LOADING_MORE:
         const updatedSelection = getSelection(data!.chartData, selection);
-        const sidePanelTabs = [
-          {
-            menuItem: intl.formatMessage({
-              id: 'tab.info',
-              defaultMessage: 'Info',
-            }),
-            render: () => (
-              <Details gedcom={data!.gedcom} indi={updatedSelection.id} />
-            ),
-          },
-          {
-            menuItem: intl.formatMessage({
-              id: 'tab.settings',
-              defaultMessage: 'Settings',
-            }),
-            render: () => (
-              <ConfigPanel
-                config={config}
-                onChange={(config) => {
-                  setConfig(config);
-                  toggleDetails(config, data);
-                  updateUrl(configToArgs(config));
-                }}
-              />
-            ),
-          },
-        ];
         return (
           <div id="content">
             <ErrorPopup
@@ -547,13 +531,21 @@ export function App() {
             {state === AppState.LOADING_MORE ? (
               <Loader active size="small" className="loading-more" />
             ) : null}
-            {renderChart(updatedSelection)}
-            {showSidePanel ? (
-              <Media greaterThanOrEqual="large" className="sidePanel">
-                <Tab panes={sidePanelTabs} />
-              </Media>
-            ) : null}
-            <Changelog />
+            <SidebarPushable>
+              <SidePanel
+                data={data!}
+                selectedIndiId={updatedSelection.id}
+                config={config}
+                expanded={showSidePanel}
+                onToggle={onToggleSidePanel}
+                onConfigChange={(config) => {
+                  setConfig(config);
+                  updateChartWithConfig(config, data);
+                  updateUrl(configToArgs(config));
+                }}
+              />
+              <SidebarPusher>{renderChart(updatedSelection)}</SidebarPusher>
+            </SidebarPushable>
           </div>
         );
 
diff --git a/src/chart.tsx b/src/chart.tsx
index f1515cf..5765211 100644
--- a/src/chart.tsx
+++ b/src/chart.tsx
@@ -14,6 +14,7 @@ import {useEffect, useRef} from 'react';
 import {IntlShape, useIntl} from 'react-intl';
 import {
   ChartHandle,
+  ChartInfo,
   CircleRenderer,
   createChart,
   DetailedRenderer,
@@ -24,7 +25,7 @@ import {
   RelativesChart,
   ChartColors as TopolaChartColors,
 } from 'topola';
-import {ChartColors, Ids, Sex} from './config';
+import {ChartColors, Ids, Sex} from './sidepanel/config/config';
 import {Media} from './util/media';
 import {usePrevious} from './util/previous-hook';
 
@@ -252,6 +253,40 @@ function getRendererType(chartType: ChartType) {
   }
 }
 
+/** Returns the element’s usable width and height by subtracting the assumed scrollbar size. */
+function getScrollbarAwareSize(
+  element: Element,
+  scrollbarSize = 20,
+): [number, number] {
+  const htmlElement = element as HTMLElement;
+  return [
+    htmlElement.clientWidth - scrollbarSize,
+    htmlElement.clientHeight - scrollbarSize,
+  ];
+}
+
+/**
+ * Calculates the allowed zoom scale range.
+ * Sets the minimum scale so the chart cannot zoom out beyond full visibility,
+ * and fixes the maximum scale at 2.
+ */
+function calculateScaleExtent(
+  parent: Element,
+  scale: number,
+  chartInfo: ChartInfo,
+): [number, number] {
+  const [availWidth, availHeight] = getScrollbarAwareSize(parent);
+
+  const zoomOutFactor = min([
+    1,
+    scale,
+    availWidth / chartInfo.size[0],
+    availHeight / chartInfo.size[1],
+  ])!;
+
+  return [max([0.1, zoomOutFactor])!, 2];
+}
+
 export interface ChartProps {
   data: JsonGedcomData;
   selection: IndiInfo;
@@ -328,20 +363,18 @@ class ChartWrapper {
     });
     const svg = select('#chartSvg');
     const parent = select('#svgContainer').node() as Element;
-
     const scale = zoomTransform(parent).k;
-    const zoomOutFactor = min([
-      1,
+    const extent: [number, number] = calculateScaleExtent(
+      parent,
       scale,
-      parent.clientWidth / chartInfo.size[0],
-      parent.clientHeight / chartInfo.size[1],
-    ])!;
-    const extent: [number, number] = [max([0.1, zoomOutFactor])!, 2];
+      chartInfo,
+    );
 
     this.zoomBehavior = zoom()
       .scaleExtent(extent)
       .translateExtent([[0, 0], chartInfo.size])
       .on('zoom', (event) => zoomed(chartInfo.size, event));
+
     select(parent).on('scroll', scrolled).call(this.zoomBehavior);
 
     const scrollTopTween = (scrollTop: number) => {
diff --git a/src/index.css b/src/index.css
index 410ba08..ce21126 100644
--- a/src/index.css
+++ b/src/index.css
@@ -14,9 +14,15 @@ body, html {
 
 #content {
   flex: 1 1 auto;
-  display: flex;
-  overflow: hidden;
   height: 100%;
+  overflow: hidden;
+}
+
+#introContent {
+  flex: 1 1 auto;
+  height: 100%;
+  overflow: hidden;
+  display: flex;
 }
 
 #svgContainer {
@@ -24,13 +30,6 @@ body, html {
   overflow: auto;
 }
 
-.sidePanel {
-  flex: 0 0 320px;
-  overflow: auto;
-  border-left: solid #ccc 1px;
-  overflow-x: hidden;
-}
-
 .hidden {
   display: none;
 }
@@ -147,10 +146,12 @@ div.zoom {
 .details {
   padding: 15px 0px;
   border-bottom: 1px solid rgba(34,36,38,.15);
+  overflow-y: auto;
+  height: calc(100% - 43px);
 }
 
 .details .ui.items .item .content {
-  padding: 0 15px;
+  padding: 0 15px 0 25px;
 }
 
 .details .item-header {
@@ -166,8 +167,6 @@ div.zoom {
 }
 
 .details .person-image {
-  max-width: 289px;
-  width: 289px;
   padding: 0 10px;
 }
 
@@ -278,3 +277,85 @@ div.zoom {
 #dotatsoSvgContainer .link {
   stroke: black;
 }
+
+#content .pusher {
+  height: 100%;
+  display: flex;
+  overflow: hidden;
+}
+
+#content #sidebar.wide ~ .pusher {
+  width: calc(100% - 350px);
+  transform: none;
+}
+
+#content #sidebar.very.thin ~ .pusher {
+  width: calc(100% - 60px);
+}
+
+#sidebar {
+  overflow: hidden;
+  height: 100%;
+}
+
+#sideTabs {
+  height: 100%;
+}
+
+#sideTabs > .ui.tabular.menu{
+  padding-left: 60px;
+}
+
+#sideToggle {
+  position: absolute;
+  background: inherit;
+  top: 0;
+  height: 42px;
+  border-radius: 0;
+  width: 60px;
+}
+
+#sideToggle:hover {
+  background-color: #ddd;
+}
+
+.collapsed-details {
+  width: 100%;
+  height: 100%;
+  display: grid;
+  place-items: center;
+}
+
+.collapsed-details .vertical-name {
+  writing-mode: vertical-rl;
+  transform: rotate(180deg);
+  transform-origin: center;
+  font-size: 1.2rem;
+  font-weight: bold;
+  white-space: pre;
+}
+
+@media (max-width: 767px) {
+  #sidebar.wide {
+    width: 100%;
+  }
+
+  #sidebar.very.thin {
+    width: 35px;
+  }
+
+  #content #sidebar.wide ~ .pusher {
+    width: 0;
+  }
+
+  #content #sidebar.very.thin ~ .pusher {
+    width: calc(100% - 35px);
+  }
+
+  #sidebar.very.thin #sideToggle {
+    width: 35px;
+  }
+}
+
+
+
diff --git a/src/intro.tsx b/src/intro.tsx
index a4512ea..b4e97d8 100644
--- a/src/intro.tsx
+++ b/src/intro.tsx
@@ -141,7 +141,7 @@ function Contents() {
 /** The intro page. */
 export function Intro() {
   return (
-    <div id="content">
+    <div id="introContent">
       <div className="backgroundImage" />
       <Card className="intro">
         <Card.Content as={Media} greaterThanOrEqual="large">
diff --git a/src/config.tsx b/src/sidepanel/config/config.tsx
similarity index 100%
rename from src/config.tsx
rename to src/sidepanel/config/config.tsx
diff --git a/src/details/additional-files.tsx b/src/sidepanel/details/additional-files.tsx
similarity index 100%
rename from src/details/additional-files.tsx
rename to src/sidepanel/details/additional-files.tsx
diff --git a/src/sidepanel/details/collapsed-details.tsx b/src/sidepanel/details/collapsed-details.tsx
new file mode 100644
index 0000000..9a972f9
--- /dev/null
+++ b/src/sidepanel/details/collapsed-details.tsx
@@ -0,0 +1,26 @@
+import {FormattedMessage} from 'react-intl';
+import {GedcomData} from '../../util/gedcom_util';
+
+interface Props {
+  gedcom: GedcomData;
+  indi: string;
+}
+
+export function CollapsedDetails(props: Props) {
+  const entries = props.gedcom.indis[props.indi].tree;
+  const nameEntry = entries.find((entry) => entry.tag === 'NAME');
+
+  const fullName = nameEntry?.data.replaceAll('/', '') ?? '';
+
+  return (
+    <div className="collapsed-details">
+      {fullName ? (
+        <span className="vertical-name">{fullName}</span>
+      ) : (
+        <span className="vertical-name">
+          <FormattedMessage id="name.unknown_name" defaultMessage="N.N." />
+        </span>
+      )}
+    </div>
+  );
+}
diff --git a/src/details/details.tsx b/src/sidepanel/details/details.tsx
similarity index 99%
rename from src/details/details.tsx
rename to src/sidepanel/details/details.tsx
index 19c818d..7eeab17 100644
--- a/src/details/details.tsx
+++ b/src/sidepanel/details/details.tsx
@@ -10,7 +10,7 @@ import {
   getImageFileEntry,
   getNonImageFileEntry,
   mapToSource,
-} from '../util/gedcom_util';
+} from '../../util/gedcom_util';
 import {AdditionalFiles} from './additional-files';
 import {ALL_SUPPORTED_EVENT_TYPES, Events} from './events';
 import {MultilineText} from './multiline-text';
diff --git a/src/details/event-extras.tsx b/src/sidepanel/details/event-extras.tsx
similarity index 98%
rename from src/details/event-extras.tsx
rename to src/sidepanel/details/event-extras.tsx
index 3929ea5..b756832 100644
--- a/src/details/event-extras.tsx
+++ b/src/sidepanel/details/event-extras.tsx
@@ -9,7 +9,7 @@ import {
   Popup,
   Tab,
 } from 'semantic-ui-react';
-import {Source} from '../util/gedcom_util';
+import {Source} from '../../util/gedcom_util';
 import {AdditionalFiles, FileEntry} from './additional-files';
 import {MultilineText} from './multiline-text';
 import {Sources} from './sources';
diff --git a/src/details/events.tsx b/src/sidepanel/details/events.tsx
similarity index 98%
rename from src/details/events.tsx
rename to src/sidepanel/details/events.tsx
index e4d3b0c..9eabf9b 100644
--- a/src/details/events.tsx
+++ b/src/sidepanel/details/events.tsx
@@ -5,8 +5,8 @@ import {FormattedMessage, IntlShape, useIntl} from 'react-intl';
 import {Link, useLocation} from 'react-router';
 import {Header, Item} from 'semantic-ui-react';
 import {DateOrRange, getDate} from 'topola';
-import {calcAge} from '../util/age_util';
-import {compareDates, formatDateOrRange} from '../util/date_util';
+import {calcAge} from '../../util/age_util';
+import {compareDates, formatDateOrRange} from '../../util/date_util';
 import {
   dereference,
   GedcomData,
@@ -20,7 +20,7 @@ import {
   resolveDate,
   resolveType,
   Source,
-} from '../util/gedcom_util';
+} from '../../util/gedcom_util';
 import {FileEntry} from './additional-files';
 import {EventExtras, Image} from './event-extras';
 import {TranslatedTag} from './translated-tag';
diff --git a/src/details/multiline-text.tsx b/src/sidepanel/details/multiline-text.tsx
similarity index 100%
rename from src/details/multiline-text.tsx
rename to src/sidepanel/details/multiline-text.tsx
diff --git a/src/details/sources.tsx b/src/sidepanel/details/sources.tsx
similarity index 91%
rename from src/details/sources.tsx
rename to src/sidepanel/details/sources.tsx
index 3f81ea3..c563d3b 100644
--- a/src/details/sources.tsx
+++ b/src/sidepanel/details/sources.tsx
@@ -1,8 +1,8 @@
 import {useIntl} from 'react-intl';
 import Linkify from 'react-linkify';
 import {List} from 'semantic-ui-react';
-import {formatDateOrRange} from '../util/date_util';
-import {Source} from '../util/gedcom_util';
+import {formatDateOrRange} from '../../util/date_util';
+import {Source} from '../../util/gedcom_util';
 
 interface Props {
   sources?: Source[];
diff --git a/src/details/translated-tag.tsx b/src/sidepanel/details/translated-tag.tsx
similarity index 100%
rename from src/details/translated-tag.tsx
rename to src/sidepanel/details/translated-tag.tsx
diff --git a/src/details/wrapped-image.tsx b/src/sidepanel/details/wrapped-image.tsx
similarity index 100%
rename from src/details/wrapped-image.tsx
rename to src/sidepanel/details/wrapped-image.tsx
diff --git a/src/sidepanel/side-panel.tsx b/src/sidepanel/side-panel.tsx
new file mode 100644
index 0000000..28a96e9
--- /dev/null
+++ b/src/sidepanel/side-panel.tsx
@@ -0,0 +1,63 @@
+import {useIntl} from 'react-intl';
+import {Button, Icon, Sidebar, Tab} from 'semantic-ui-react';
+import {TopolaData} from '../util/gedcom_util';
+import {Config, ConfigPanel} from './config/config';
+import {CollapsedDetails} from './details/collapsed-details';
+import {Details} from './details/details';
+
+interface SidePanelProps {
+  data: TopolaData;
+  selectedIndiId: string;
+  config: Config;
+  onConfigChange: (config: Config) => void;
+  expanded: boolean;
+  onToggle: () => void;
+}
+
+export function SidePanel({
+  data,
+  selectedIndiId,
+  config,
+  onConfigChange,
+  expanded,
+  onToggle,
+}: SidePanelProps) {
+  const intl = useIntl();
+
+  const tabs = [
+    {
+      menuItem: intl.formatMessage({
+        id: 'tab.info',
+        defaultMessage: 'Info',
+      }),
+      render: () => <Details gedcom={data.gedcom} indi={selectedIndiId} />,
+    },
+    {
+      menuItem: intl.formatMessage({
+        id: 'tab.settings',
+        defaultMessage: 'Settings',
+      }),
+      render: () => <ConfigPanel config={config} onChange={onConfigChange} />,
+    },
+  ];
+
+  return (
+    <Sidebar
+      id="sidebar"
+      animation="overlay"
+      icon="labeled"
+      width={expanded ? 'wide' : 'very thin'}
+      direction="right"
+      visible={true}
+    >
+      {expanded ? (
+        <Tab id="sideTabs" panes={tabs} />
+      ) : (
+        <CollapsedDetails gedcom={data.gedcom} indi={selectedIndiId} />
+      )}
+      <Button id="sideToggle" icon size="mini" onClick={() => onToggle()}>
+        <Icon size="large" name={expanded ? 'arrow right' : 'arrow left'} />
+      </Button>
+    </Sidebar>
+  );
+}