To change how Dynalist looks for you, you can change settings under Settings - Preferences - Appearance. For example, you can choose a different theme and tweak font settings.
For those who want more customization and are well versed in CSS, you can use plugins like Stylish to add your own styles.
Others have written and shared user styles for Dynalist as well, which can be found here. If you want to share your user style too, simply post it to userstyles.org and mention Dynalist in the title or the description.