🎨 modularize code

Author: ayush2k

lib/form/html.js

@@ -152,15 +152,15 @@ const renderer = (type, errors) => {
           render += `<button type="button" class="delete--button" id="${input.id}--delete--${index}">Delete</button>`;
           render += '</div>';
         });
-        render += `<button type="button" class="add--button" id="${input.id}--add">Add</button>`;
+        render += `<button type="button" class="form--add" id="${input.id}--add">Add</button>`;
       }
       else if (input.repeatable && input.repeatable === true) {
         render += `<div id="sub-${input.id}" class="form--repeatable">`;
 
         // Add error messaging and required
         render += addRequired(addError(html, input, errors), input);
         render += '</div>';
-        render += `<button type="button" class="add--button" id="${input.id}--add">Add</button>`;
+        render += `<button type="button" class="form--add" id="${input.id}--add">Add</button>`;
       }
       else {
         // Add error messaging and required