Sizing elements to percentage of screen width/height

Question

Is there a simple (non-LayoutBuilder) way to size an element relative to screen size (width/height)? For example: how do I set the width of a CardView to be 65% of the scree

Answer 1

You could build a Column/Row with Flexible or Expanded children that have flex values that add up to the percentages you want.

You may also find the AspectRatio widget useful.