[ID-143] The Onboarding Image is not shown full width

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (7a7b8e7) 85.44% compared to head (8dae640) 85.44%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #157 +/- ## ======================================= Coverage 85.44% 85.44% ======================================= Files 60 60 Lines 1931 1931 ======================================= Hits 1650 1650 Misses 281 281 ``` | [Impacted Files](https://codecov.io/gh/suesitran/interactive_diary/pull/157?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [.../features/onboarding/second\_onboarding\_screen.dart](https://codecov.io/gh/suesitran/interactive_diary/pull/157?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-bGliL2ZlYXR1cmVzL29uYm9hcmRpbmcvc2Vjb25kX29uYm9hcmRpbmdfc2NyZWVuLmRhcnQ=) | `97.46% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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