You can apply the CSS rules to a particular column using the .active-column-n selector, where n is a datasource index of your column.
<style> .active-column-1 { width: 200px; color: #000099; background: #ffffcc; text-align: right; font-weight: bold; } </style>
CSS rules apply both to column cells and column header.
Same thing in javascript (cells only):