feat(toolbar): Tweak css reset a little more

[ryan953]

Just came across https://css-tricks.com/alvaro-montoro-css-one-liners-to-improve-almost-every-project/ and thought there are some easy to incorporate things that will be good for this as an sdk.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.15%. Comparing base (2118b23) to head (2b3848d).
Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #74666   +/-   ##
=======================================
  Coverage   78.15%   78.15%           
=======================================
  Files        6724     6723    -1     
  Lines      299920   299907   -13     
  Branches    51593    51597    +4     
=======================================
+ Hits       234401   234402    +1     
+ Misses      59198    59187   -11     
+ Partials     6321     6318    -3     

Files	Coverage Δ
static/app/components/devtoolbar/styles/global.ts	0.00% <ø> (ø)

... and 5 files with indirect coverage changes