fix(pfFilterPanel): make filter panel background semi-transparent

[dtaylor113]

Description

Make the filter panel background semi-transparent to see content under the panel.

Before:

After:

Related Issue: https://github.com/openshift/origin-web-catalog/issues/536

PR Checklist

• [X] Screenshots are attached (if there are visual changes in the UI)
• [X] A Designer (@beanh66) is assigned as a reviewer (if there are visual changes in the UI)
• [X] A CSS rep (@cshinn) is assigned as a reviewer (if there are visual changes in the UI)

[jeff-phillips-18]

@beanh66 Is there an issue filed to update this in the design pattern at http://www.patternfly.org/pattern-library/forms-and-controls/filter/#/design

[beanh66]

Thanks @jeff-phillips-18 I will create an issue for that update in PF design.

[jeff-phillips-18]

@dtaylor113 Could you update to patternfly 3.36.0 or greater to see if that fixes the Node Security check failure?

[dtaylor113]

@dtaylor113 Could you update to patternfly 3.36.0 or greater to see if that fixes the Node Security check failure?

Upgraded to patternfly 3.36.0, that seemed to fix the Node Security issue.