add sticky position for office__top

Author: Awakich

projects/social_platform/src/app/office/office.component.scss

@@ -36,11 +36,16 @@
     justify-content: space-between;
     padding: 30px 5px 30px 17px;
     background: linear-gradient(var(--accent), #4d3780);
+    position: sticky;
+    top: 0;
+    left: 0;
+    z-index: 100;
 
     @include responsive.apply-desktop {
       flex-shrink: 0;
       padding: 0;
       background: none;
+      position: static;
     }
   }