Updated shadow control to be able to handle "absolute null" situation

src/components/shadow_control/shadow_control.scss

@@ -69,6 +69,16 @@
     }
   }
 
+  .inset-alert {
+    padding: 0.25em 0.5em;
+  }
+
+  &.disabled {
+    .inset-alert {
+      opacity: 0.2;
+    }
+  }
+
   .shadow-preview {
     order: 2;
     flex: 3 3 15em;
@@ -94,7 +104,7 @@
 
     .input-light-grid {
       grid-area: options;
-      justify-self: end;
+      justify-self: center;
     }
 
     .input-number {
@@ -176,3 +186,8 @@
     }
   }
 }
+
+.inset-tooltip {
+  padding: 0.5em;
+  max-width: 30em;
+}