remove unnecessary classNames

src/components/Fields/Extensions.tsx

@@ -27,7 +27,7 @@ export class Extensions extends React.PureComponent<ExtensionsProps> {
           <>
             {options.showExtensions &&
               Object.keys(exts).map(key => (
-                <Extension key={key} className="extension">
+                <Extension key={key}>
                   <FieldLabel> {key.substring(2)}: </FieldLabel>{' '}
                   <ExtensionValue>
                     {typeof exts[key] === 'string' ? exts[key] : JSON.stringify(exts[key])}

src/components/Schema/Schema.tsx

@@ -87,7 +87,7 @@ export class Schema extends React.Component<Partial<SchemaProps>> {
     } as any as FieldModel; // cast needed for hot-loader to not fail
 
     return (
-      <div className="field-details">
+      <div>
         <FieldDetails field={field} />
       </div>
     );