After several revisions:

Client: Can you make the font yellow on a white background? I worry that it might not be readable at night. So, I thought it’s best if it’s glowing at night. Thanks so much!

I tried to tell the client that, if clarity was a concern, that’s not a very good combination. However, she stuck by her request. I changed the font color to mustard yellow and outlined it with black. 

Client: It’s good, but let’s make it a neon yellow and lose the outline.