1. Go to onMessage > Website > select the website > Styles.
  2. Search for the block style that you wish to change.
  3. Click the pencil icon to edit the style.
  4. From the Default menu, select Content Types.
  5. Then select Lists.
  6. Click directly on a photo placeholders to expose the Photo element information on the left.
  7. On the left, scroll down to where you see Padding.
  8. Enter a number for the Padding. For example, 5 px or 10 px are good choices to start with. Then, you can make adjustments from there according to your preferences.
  9. Apply the changes.