Blockpress theme has a lot of ready style presets for each core blocks. But there are also some additional classes which you can add in Class section
You can mix these classes with styles.
Negative margins. Allows to make some overflowed elements.
Classes are next
Post featured Image block
Class to make some hover scale effect
fr-soft-rounded fr-hard-rounded fr-cubebtnwhite fr-cubebtndark
Use one of these classes to add round corners, 3d button effect to navigation block
Will make collapsible columns not only on mobiles but also on tablets
Will turn regular search block into sliding search which will be visible on click. You can see such search icon in header of this site. Search must be placed in header part
Must be added to header template part if you want to make transparent header. Anyway, theme has predefined transparent template part