The default part styles for the new Event Registration Form part are probably not included in any of the stylesheets.

You can either add all default part styles to be included in your list of stylesheets or you can insert just the new Event Registration Form part styles into a specific stylesheet.

To add all default part styles:
  1. Log into NetCommunity as a site administrator
  2. Navigate to Site Explorer > Stylesheets
  3. Click the Desktop Browsers tab
  4. Click the link below the list of stylesheets to Insert Default Part Styles
  5. Click Save

To add only the default Event Registration Form part styles to a specific stylesheet:
  1. Log into NetCommunity as a site administrator
  2. Navigate to Site Explorer > Stylesheets
  3. Click the Desktop Browsers tab
  4. Click to edit the stylesheet into which you'd like to add this part's default styles
  5. Above the styles, click the Insert CSS Selectors link
  6. In the drop-down list, choose Event Registration Form
  7. Check the box to Include Defaults
  8. Click Insert and then Save
Note that if you use Mobile stylesheets and would like for the new Event Registration Form part styles to appear when your site is accessed from mobile devices, repeat one of the processes above, choosing the Mobile Browsers tab to apply the styles there as well.