Problem/Motivation
Claro uses the default box-model "content-box", what causes unnecessary calculations for width and height (+ min-* & max-*) attributes.
Proposed resolution
Use "border-box" as described here: https://css-tricks.com/inheriting-box-sizing-probably-slightly-better-be...
I think border-box still is the de facto standard / best-practise since years, so i don't know why content-box is used in Claro?