CSS not taking effect

Site URL: http://anitaksolutions.com

Hi team...

I'm trying to make some simple adjustments for a client but I'm kinda stuck.

The first one I'm trying to do is to make all three buttons the same size on the client's front page.  When I look up the CSS Element all I see is a class that if modified changes the settings for the other two buttons and not just the middle button that. want to size to match the others. Am I missing something or is this just not possible?

http://anitaksolutions.com

Second...I have the proper selector and code to change the background color of the Spotify player.  When I change it in the the browser css console I can see the change happen.  When I copy it to the Custom CSS area on the website the CSS never takes effect and I can't even see that it's been added when I inspect the element.

/*SETS BG COLOR OF SPOTIFY PLAYER*/
.css-1g2au9z {
    background-color: #44cce4 !important;
}
.css-xo2a70 {
    background-color: #44cce4 !important;
}

http://anitaksolutions.com/audio

Any ideas on what I can do with these to make it work?

Thanks in advance :-)