Html text input of width 100% slightly overrunning end of containing table cell

Fairly simple question; I have a table which contains form inputs in HTML and have set one of the elements to span 100% of the width of the table. However, it seems to ever so slightly overrun the end of the cell it is contained in:

http://ift.tt/1OCdHhP

.queryinput {
    width:100%;
}

it is barely noticeable in the jsfiddle but on my page it is a large table spanning about 80% of the screen so looks very untidy. Any help would be greatly appreciated.