Update

Author: svekars

_static/css/custom.css

@@ -104,3 +104,8 @@
 .gsc-search-button-v2 {
    border-color: #ee4c2c;
 }
+
+.gsc-search-button:active,
+.gsc-search-button:hover {
+   border-color: #ee4c2c;
+}