CalendarExtender inside styled table?

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CSS

Ajax

Ok, this one is driving me batty.

I have a web page with a table. The table contains various input controls that let the user select database search parameters. There are two asp:TextBox / asp:Image combos implementing two ajax:CalendarExtender controls.

The table is styled to include additional padding in the cells, to give some visual space between the controls:

table.Search td {
    padding:0.25em;
    border-top:solid 1px #000;
    border-right:solid 1px #000;
    border-bottom:solid 1px #000;
    vertical-align:middle;
}
        
table.Search th {
    padding:0.25em;
    border-top:solid 1px #000;
    border-left:solid 1px #000;
    border-bottom:solid 1px #000;
    background-color:#fff;
    font-weight:bold;
    vertical-align:middle;
}

My problem seems to come with the padding and border styles: they are being inherited by the AJAX control, with the result that the calendar cells are not completely bordered (because the td lacks a left border) and there is too much padding in the cells, so the drop-down calendar does not display half of Friday, all of Saturday, and is missing all of the bottom row.

I have tried styling the calendar directly, like so:

.ajax__calendar_body td,
.ajax__calendar_body th {
	padding:0;
	margin:0;
}

.ajax__calendar_dayname {
	margin:0;
	padding:0;
}

.ajax__calendar_day {
	margin:0;
	padding:0;
}

and I can do some things, like change background color and font weight, but I cannot get rid of the (censored) padding. Any suggestions?