Add base visibility style to stop layout shift (#18)

Author: Jonezzyboy

scss/shared/_base.scss

@@ -68,6 +68,10 @@ small {
   display: none;
 }
 
+.visibility-hidden {
+  visibility: hidden;
+}
+
 h1, h2, h3, h4, h5, h6 {
   font-weight: 600;
   color: rgb(var(--zn-text-heading));