Borders disappear in Chrome when I zoom in

Question

I have this really simple form: http://jsfiddle.net/TKb6M/91/. Sometimes, when I zoom in or out using Chrome, the input borders disappear. For example, when I zoom to 90% I

Answer 1

I know I'm late in the game, but fudging it a bit and set the border width to 1.5px seems to do the trick every time.