in Chrome for Mac, why do buttons become square after the background color is set (usually it is rounded)?
<html>
<body>
<input type="button" id="bt1" value="Click me!" onmouseover="this.style.backgroundColor='red;'" onmouseout="this.style.backgroundColor='transparent';">
</body>
</html>
Web page when the mouse was not above the button:

Web page when the mouse is above the button:

The web page after the mouse was above the button:

How to set a background without a square button?
Thanks.
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