Change style params at devtools console

Question

I need help with writing commands in DevTool console. I want to change some params of selected element, like on screenshot.

I want to change width, color, opacity. With console code, not manually!

For example, this code (with different class name) work on this webpage (stackoverflow.com), but doesn't work on my target page. I try to do it on browser game, HTML page.

$('.blackjack-seat__icon').css({'width': '20%', 'opacity':'1', 'color':'red'});