Outline Buttons
You can turn any standard button into an outline button by using the class .btn--outline.
The .btn--outline class must be used in conjunction with .btn--{color} classes to control the button's color and .btn--{size} classes to change the button's text size.
Note: Outline variants must be enabled in the dashboard. Navigate to Buttons & Links > Options and ensure "Outline Variants" is turned on for the button colors you want to use.

Changes From 3.x
In ACSS 4.0:
- Outline button border width is now unified with solid button border width, ensuring consistent button heights when solid and outline buttons are placed side by side.