Each grid column (cell, header and footer templates) is assigned a CSS class .aw-column-n
where n is a column index. The width of each column can be set with CSS width
attribute
.aw-column-1 {width: 200px;}
Use object id if you have several grids on one page -
#myGrid1 .aw-column-1 {width: 200px;}
#myGrid2 .aw-column-1 {width: 30px;}
The column width can also be set using column width property -
obj.setColumnWidth(200, 1); // set col-1 width to 200px
Class reference - column width