fix: style issue of the fullscreen button in Code input

[ruibaby]

What type of PR is this?

/area ui
/kind bug
/milestone 2.20.x

What this PR does / why we need it:

为 Code Input 设置默认高度，修复全屏按钮被遮挡的问题。

Which issue(s) this PR fixes:

Fixes #6681

Does this PR introduce a user-facing change?

为 Code Input 设置默认高度，修复全屏按钮被遮挡的问题。

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[guqing]

/lgtm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.88%. Comparing base (5b2bdfd) to head (3fb7bd4).
Report is 42 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6785      +/-   ##
============================================
- Coverage     58.00%   57.88%   -0.13%     
- Complexity     3977     4017      +40     
============================================
  Files           696      709      +13     
  Lines         23517    23851     +334     
  Branches       1567     1574       +7     
============================================
+ Hits          13641    13805     +164     
- Misses         9255     9424     +169     
- Partials        621      622       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[LIlGG]

/lgtm

[JohnNiang]

/approve

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• ui/OWNERS [JohnNiang]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment