Your system information

• Steam client version: Latest stable
• Distribution (e.g. Ubuntu): Ubuntu 16.04.1
• Opted into Steam client beta?: [Yes/No] No
• Have you checked for system updates?: [Yes/No]Yes

Please describe your issue in as much detail as possible:

Incredibly difficult to see hidden black text hidden by posters when pointing the mouse
it should reveal easy but no.

Steps for reproducing this issue:

1. Just try to reveal any black box hidden text with the mouse