feat: update how back buttons are styled #1166

Job	Run time
setup	5s
test (./examples/with-emailverification-then-password-thirdpartyemailpassword)	5m 29s
test (./examples/with-update-email-post-verification)	4m 41s
test (./examples/with-emailpassword-vercel)	4m 11s
test (./examples/with-no-session-on-sign-up-thirdpartyemailpassword)	4m 11s
test (./examples/with-account-linking)	4m 42s
test (./examples/with-i18next)	5m 41s
test (./examples/with-phone-password)	4m 12s
test (./examples/with-one-login-per-subdomain)	7m 52s
test (./examples/with-svelte-react-thirdpartyemailpassword)	4m 41s
test (./examples/with-sign-in-up-split-emailpassword)	4m 52s
test (./examples/with-netlify)	5m 39s
test (./examples/with-localstorage)	2m 54s
test (./examples/with-multiple-email-sign-in)	5m 48s
test (./examples/with-thirdpartyemailpassword-2fa-passwordless)	6m 1s
test (./examples/with-thirdpartyemailpassword-passwordless)	6m 10s
test (./examples/with-emailverification-with-otp)	4m 24s
test (./examples/with-cli-login)	4m 20s
	1h 25m 53s

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