Fix some styles for laptop screens

[cakecatz]

What this PR does / why we need it:

• Fix a bug that prevented the settings page from scrolling on small screens
• Adjust text size
• Adjust the Deployment Detail style

Before

After

Which issue(s) this PR fixes:

Fixes #1935

Does this PR introduce a user-facing change?:

Fix broken layout at some pages on small screens

[pipecd-bot]

Code coverage for golang is 33.51%. This pull request does not change code coverage.

[pipecd-bot]

Code coverage for javascript is 85.66%. This pull request does not change code coverage.

[nghialv]

/lgtm

[khanhtc1202]

Nice 🙌
/approve

[pipecd-bot]

This pull request is APPROVED by khanhtc1202.

Approvers can cancel the approval by writing /approve cancel in a comment. Any additional commits also will change this pull request to be not-approved.