The page has the following CSS:
input[type=text] { display: inline; padding: 7px; background-color: #f6f6f6; font-size: 12px; letter-spacing: 1px; border
As you can see at this link: http://www.w3.org/TR/CSS2/cascade.html#specificity, all selectors has specificity value. So, if you write such css rule: #txt1 {}, you can reset all unnecessary values.
#txt1 {}