Background image bug for project wizard dialog

[mattkerlogue]

Issue

Some of the classes relating to elements in the new project wizard dialog (File > New Project...) have a background property in their CSS that makes the section of the dialog unreadable. Specifically the following classes:

• .GEL-OVUBJ2, the back button
• .GEL-OVUBL2, the main content area of the dialog

Screenshots of problem

File > New Project ... > New Directory > New Project

File > Existing Directory

File > Version Control

Solution

Override the background property of the two CSS classes, .GEL-OVUBJ2 and .GEL-OVUBL2. An override is also needed when the back button is being pressed, i.e. on .GEL-OVUBJ2:focus. The back button override likely also needs a border/outline (as per the cancel button in the bottom right of the dialogs).

Dialog as expected (background property of CSS classes disabled via the chromium developer tools inspector)

[kieran-mace]

This PR seems to fix the issue: https://github.com/dracula/rstudio/pull/13