ux(): added dashboard-padding variable

public/sass/_variables.scss

@@ -215,3 +215,6 @@ $btn-border-radius:              3px;
 
 // sidemenu
 $side-menu-width:  14rem;
+
+// dashboard
+$dashboard-padding: $spacer / 2;

public/sass/components/_tabbed_view.scss

@@ -1,7 +1,8 @@
 .tabbed-view {
   background-color: $page-bg;
   background-image: linear-gradient(60deg, transparent 70%, darken($page-bg, 4%) 98%);
-  margin: -($spacer/2) 0 $spacer*2 0;
+  margin: -$dashboard-padding;
+  margin-bottom: $spacer*2;
   padding: $spacer*2;
 }
 

public/sass/layout/_page.scss

@@ -4,7 +4,7 @@
 }
 
 .dashboard-container {
-  padding: $spacer / 2;
+  padding: $dashboard-padding;
   width: 100%;
 }