Merge branch 'fix-squishy-bubbles' into 'staging'

Fix squishy principle bubbles when sizing down

See merge request !17

source/css/index.css

@@ -60,6 +60,7 @@ a {
 }
 .priciple-heading-number-bubble {
+  flex-shrink: 0;
   display: inline-flex;
   flex-direction: column;
   justify-content: center;