diff --git a/.changeset/tough-glasses-tan.md b/.changeset/tough-glasses-tan.md
new file mode 100644
index 0000000000..4d4e7e9fa9
--- /dev/null
+++ b/.changeset/tough-glasses-tan.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/starlight': patch
+---
+
+Prevent list items from overflowing Markdown content
diff --git a/packages/starlight/style/markdown.css b/packages/starlight/style/markdown.css
index d0e2248eb1..1f065ff9eb 100644
--- a/packages/starlight/style/markdown.css
+++ b/packages/starlight/style/markdown.css
@@ -18,6 +18,10 @@
 	margin-top: 0.25rem;
 }
 
+.sl-markdown-content li:not(:where(.not-content *)) {
+	overflow-wrap: anywhere;
+}
+
 .sl-markdown-content
 	li
 	> :last-child:not(li, ul, ol):not(a, strong, em, del, span, input, :where(.not-content *)) {
diff --git a/packages/starlight/user-components/Tabs.astro b/packages/starlight/user-components/Tabs.astro
index f93475c17b..806941bcb0 100644
--- a/packages/starlight/user-components/Tabs.astro
+++ b/packages/starlight/user-components/Tabs.astro
@@ -65,6 +65,7 @@ const { html, panels } = processPanels(panelHtml);
 		border-bottom: 2px solid var(--sl-color-gray-5);
 		color: var(--sl-color-gray-3);
 		outline-offset: var(--sl-outline-offset-inside);
+		overflow-wrap: initial;
 	}
 	.tab [role='tab'][aria-selected='true'] {
 		color: var(--sl-color-white);