button CSS in themes

I found this and im not happy.
It's very difficult to style buttons to the default CSS. Every browser have your own default style. There is no "default" CSS rule. "unset", "initial" or "inherit" don't switch to the default back.

/themes/basic/common.css

/* standard buttons */
button:hover,.buttons a:hover {
    text-decoration: none;
    background-color: #dff4ff;
    border: 1px solid #CBCBCB;
    color: #FF8A00;
}

Maybe only one point is missing?
Please never do that again!