Field and Field Groups Column Width

How do I change the column width of the fields that show up in the tabbed field columns.
I want the first column to be wider.

See red circled portion of image - I need that to be on one row.

Thanks.

Hi,
Please go to file
components > com_osproperty > templates > default > style > style.css
find
.left_details_col{
width:20%;
text-align:left;
font-weight:bold;
padding:3px;
padding-left:10px;
vertical-align:top;
border:0px;
}
and change
.left_details_col{
width:30%;
text-align:left;
font-weight:bold;
padding:3px;
padding-left:10px;
vertical-align:top;
border:0px;
}

Good luck
Dam