diff --git a/ui/src/components/ContributionGraph.tsx b/ui/src/components/ContributionGraph.tsx
index ae00180..c70482e 100644
--- a/ui/src/components/ContributionGraph.tsx
+++ b/ui/src/components/ContributionGraph.tsx
@@ -93,8 +93,8 @@ export function ContributionGraph() {
       <p style={{ fontSize: '0.8rem', opacity: 0.6 }}>
         {totalCount} contributions in the last year
       </p>
-      <div style={{ overflowX: 'auto' }}>
-        <svg width={svgWidth} height={svgHeight} className="d-block">
+      <div>
+        <svg viewBox={`0 0 ${svgWidth} ${svgHeight}`} width="100%" className="d-block">
           {/* Day-of-week labels */}
           {DAY_LABELS.map((label, i) =>
             label ? (