Update Submodule

src/styles.js

+import {css} from 'lit-element';
+
+export function getSignatureCss() {
+    // language=css
+    return css`
+        #pdf-preview {
+            position: sticky;
+            top: 0px;
+        }`;
+}
\ No newline at end of file

toolkit @ d8440964

-Subproject commit c46fef42c484e3175e20a7b1b321c51e8b6c7366
+Subproject commit d8440964149b7c42b528094da2a7e112bf89bc79