[Bug] Improve the spacing between blocks

[Vivian-appflowy]

Bug Description

From Discord: https://discord.com/channels/903549834160635914/903553722804748309/1455464304282177587

How to Reproduce

Add texts with a colored background

Expected Behavior

More space between the colored blocks

Operating System

N/A

AppFlowy Version(s)

N/A

Screenshots

No response

Additional Context

No response