diff --git a/src/components/card/card.styles.ts b/src/components/card/card.styles.ts
index 082b70f7d95..45c21d8eeee 100644
--- a/src/components/card/card.styles.ts
+++ b/src/components/card/card.styles.ts
@@ -73,6 +73,7 @@ export const euiCardStyles = (
     main: {
       euiCard__main: css`
         display: flex;
+        inline-size: 100%;
       `,
       layout: {
         vertical: css`
diff --git a/upcoming_changelogs/6377.md b/upcoming_changelogs/6377.md
new file mode 100644
index 00000000000..5fd78265253
--- /dev/null
+++ b/upcoming_changelogs/6377.md
@@ -0,0 +1,3 @@
+**Bug fixes**
+
+- Fixed bug in `EuiCard` where the inner content in vertical cards was not growing 100% in width
\ No newline at end of file