Install Vencord

You will need to patch your discord client in order to
be able to use CSS customization.
One of such ways is by installing Vencord.

You can get Vencord installer from their dev website below!

Apply CSS

You should be able to see an option
called Themes under Vencord on your user settings.

You can paste the link below to the box that says "Theme Links"



Or if you want blue chat bubbles for yourself,
you could also copy the code below and paste it
to your Vencord's QuickCSS window.

Keep in mind for this workaround you will need to use
Compact Mode with Show Avatar enabled
you will also need to replace the Discord ID
at line 7 through 28 with your own.

Due to css limitations,
Avatars will be shown at Thumbnail quality