diff --git src/wp-content/themes/twentythirteen/style.css src/wp-content/themes/twentythirteen/style.css
index 4ec5cf98f3..d96a9daf75 100644
--- src/wp-content/themes/twentythirteen/style.css
+++ src/wp-content/themes/twentythirteen/style.css
@@ -602,6 +602,13 @@ textarea:focus {
 	outline: 0;
 }
 
+
+/* Search block button background CSS */
+.wp-block-search__inside-wrapper .wp-block-search__button {
+    background: inherit;
+    color: #000;
+}
+
 /* Buttons */
 button,
 input[type="submit"],