Update healthchecksui.css (background color on logo element)

[brgrz]

Background color shouldn't be used for logo image because it conflicts with images that use transparency for example SVGs (which are the standard format for logos on the web nowadays)

[dotnet-policy-service]

@brgrz please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.

@dotnet-policy-service agree [company="{your company}"]

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• (default - no company specified) I have sole ownership of intellectual property rights to my Submissions and I am not making Submissions in the course of work for my employer.

@dotnet-policy-service agree

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@dotnet-policy-service agree company="Microsoft"

Contributor License Agreement

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