Update javaguide.css

[ibrahimmemonn]

These style guides are copies of Google's internal style guides to assist developers working on Google owned and originated open source projects. Changes should be made to the internal style guide first and only then copied here.

Unsolicited pull requests will not be merged and are usually closed without comment. If a PR points out a simple mistake — a typo, a broken link, etc. — then the correction can be made internally and copied here through the usual process.

Substantive changes to the style rules and suggested new rules should not be submitted as a PR in this repository. Material changes must be proposed, discussed, and approved on the internal forums first.

[google-cla[bot]]

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