I used part of what frankie2J said above.
Go to your website’s dashboard then:
[ Moderator note: Fixed. Don’t forget to close the <li>
properly. ]
- open Gallery
- Other Options
- Styles
- click to open link that says ‘Show Customization Options’
- copy and paste the code below into window that opens
- Save
.ngg-slideshow {
height:480px;
width: 640px;
}