Pull request #31: Sticky table headers

Merge in RED/ui from sticky-headers to master

* commit '7c21b7b5d359c2ca6bac1f42ae414e0544c07ae3':
  Sticky table headers

apps/red-ui/src/assets/styles/red-page-layout.scss

@@ -38,6 +38,7 @@ body {
     padding: $right-container-padding;
     position: fixed;
     right: 0;
+    z-index: 2;
 
     .actions-row {
         display: flex;

apps/red-ui/src/assets/styles/red-tables.scss

@@ -2,12 +2,15 @@
 @import 'red-mixins';
 
 .table-header {
-    background-color: rgba(226, 228, 233, 0.9);
+    background-color: $grey-6;
     height: 50px;
     padding: 0 16px;
     display: flex;
     justify-content: space-between;
     align-items: center;
+    position: sticky;
+    top: 50px;
+    z-index: 1;
 
     .actions {
         display: flex;
@@ -16,6 +19,14 @@
     }
 }
 
+redaction-table-col-name,
+.select-oval-placeholder {
+    background-color: $white;
+    position: sticky;
+    top: 100px;
+    z-index: 1;
+}
+
 .no-data {
     grid-column: 1/-1;
     padding: 12px;