Restyle and refactor alerts

[lukaw3d]

These better match Transak mocks, and not using transparency gives us better control if we need to change them

Before	After

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ EDITORCONFIG	editorconfig-checker	12		0	0.06s
✅ JSON	eslint-plugin-jsonc	1	0	0	1.19s
✅ JSON	jsonlint	1		0	0.23s
✅ JSON	npm-package-json-lint	yes		no	0.66s
✅ JSON	prettier	1	0	0	0.7s
✅ JSON	v8r	1		0	1.49s
✅ REPOSITORY	checkov	yes		no	21.51s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ TSX	eslint	6	0	0	6.94s

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[codecov]

Codecov Report

Merging #1429 (398a676) into master (205ae52) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1429      +/-   ##
==========================================
+ Coverage   83.17%   83.25%   +0.07%     
==========================================
  Files         154      154              
  Lines        4018     4018              
  Branches      726      726              
==========================================
+ Hits         3342     3345       +3     
+ Misses        676      673       -3     

Flag	Coverage Δ
cypress	50.89% <100.00%> (+0.01%)	⬆️
jest	78.48% <66.66%> (+0.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/app/components/BuildPreviewBanner/index.tsx	100.00% <ø> (ø)
...ingPage/Features/ValidatorList/ValidatorStatus.tsx	100.00% <ø> (ø)
src/styles/theme/ThemeProvider.tsx	100.00% <ø> (ø)
src/app/components/AlertBox/index.tsx	100.00% <100.00%> (ø)
src/app/components/TransactionStatus/index.tsx	100.00% <100.00%> (ø)
...ages/AccountPage/Features/AccountSummary/index.tsx	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes