wa(front): Make the background white of all webapps (#7341)

Signed-off-by: Kimonas Sotirchos <kimwnasptd@gmail.com>

components/crud-web-apps/common/frontend/kubeflow-common-lib/projects/kubeflow/src/styles/styles.scss

@@ -96,6 +96,7 @@ mat-form-field .mat-form-field {
 html,
 body {
   margin: 0;
+  background: white;
 }
 
 .flex {