3-column panels become 1-column below 1000px width

public/css/mobile-styles.css

@@ -1,12 +1,13 @@
 /*will apply to anything 1000px or less. this catches ipads, horizontal phones, and vertical phones)*/
 @media screen and (max-width: 1000px) {
+
     #UI-Theme-Block,
     #UI-Customization,
     #power-user-options-block,
     #ContextSettings,
     #InstructSettingsColumn,
     #InstructSequencesColumn {
-        flex-basis: auto;
+        flex-basis: 100%;
     }