Bug? - opera doesn't show CSS background

HTML-CSS
1

hi, here is an issue I’ve come across.
I have a css file included in my index.php (html), and I have a

tag. I want the div tag background to be the color different from the body bg color. Opera doesn’t show it correctly (left), but Chrome does (right).
And in the opera developer tools no css mydiv bg shown.
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2

It seems that Opera creates cache of the page. After I turned it off in Network options and on then, everything is working fine.

3

Maybe because you use rgba and you don’t declarate alpha, you have writed rgba(200,100,154) but you might write rgba(200,100,154,1)