Updated the navbar css (#388)

Co-authored-by: tumms2021389 <[email protected]>

Author: SambhuPega

packages/angular-sdk-components/src/lib/_components/infra/navbar/navbar.component.scss

@@ -39,6 +39,7 @@ $natural-ease: cubic-bezier(0.4, 0.6, 0.1, 1) !default;
 .psdk-appshell-nav {
   z-index: 199;
   position: fixed;
+  top: 0;
   display: flex;
   flex-direction: column;
   justify-content: flex-start;