Display Katex spacing

src/scss/common/questions.scss

@@ -508,6 +508,13 @@ $inline-feedback-padding: 2px;
   display: inline;
 }
 
+.katex-display.katex-display {
+  // katex default is margin: 1rem 0, padding: 0. owing to issues with requiring hidden y-overflow, we move some of this
+  // to padding to "absorb" the overflow and prevent it from being cut off (helps fix latex dropzones in big latex expressions - c.f. matrices)
+  margin: 0.5rem 0;
+  padding: 0.5rem 0;
+}
+
 // cloze dropdowns inside katex are normally cut off due to content-driven overflows we cannot control easily. this:
 //    a) enforces that dropdowns are provided $cloze-dropdown-height of space (maximum height before scrolling);
 //    b) sets the correct overflow behaviour for the parent of the katex containing the dropdown;