Merge branch '165-footer-in-help-page-isn-t-at-the-bottom-of-the-page' into 'dev'

Resolve "footer in help page isn't at the bottom of the page"

Closes #165

See merge request alphabet/laboite!581

app/imports/ui/components/system/CardMessage.jsx

@@ -13,6 +13,7 @@ import { Link } from 'react-router-dom';
 const useStyles = makeStyles({
   root: {
     marginTop: 20,
+    height: '72vh',
   },
   actions: {
     display: 'flex',