DatePicker Hover over Prev and Next

DatePicker Hover over Prev and Next

When I hover over the Prev and Next buttons\links the background color (white) appears over about 1/2 of the left side of the word Prev or Next.

Of course, I'd like the background to be it's full-size.

JQuery 1.4.2
JQuery UI 1.8.1


I did make some adjustments to the DatePicker CSS as follows. I'm not sure if these adjustments caused the problem with the hover background.  

.ui-datepicker
  margin-left: 100px;
  width: 200px;
  z-index: 1000;
}
/*
 Problem: The "t" in Next in the JQuery DatePicker module
 was pushed past the right edge of the box. 

 Solution: By setting the relative position we bring in
 the word Next so it lies nicely inside the box.

*/
.ui-datepicker-next
left: 160px;
position: relative;  
}

.ui-datepicker-trigger
{
margin-left: 10px;
}

#ui-datepicker-div { display: none; }