diff --git a/packages/core/src/browser/style/hover-service.css b/packages/core/src/browser/style/hover-service.css
index 623c4834d0e92..bcd24dd606284 100644
--- a/packages/core/src/browser/style/hover-service.css
+++ b/packages/core/src/browser/style/hover-service.css
@@ -29,6 +29,7 @@
   border: 1px solid var(--theia-editorHoverWidget-border);
   padding: var(--theia-ui-padding);
   max-width: var(--theia-hover-max-width);
+  z-index: 1000;
 }
 
 .theia-hover .hover-row:not(:first-child):not(:empty) {