fixed column width for first column?

t0n1zz

hi, so my table only contain 3 column, number, name, date.... and for some reason this datatable spread witdh across table automatically. so i want to make column "number" to only have a small portion of width since it is only contain numbering order in my table and it just not beautifull to see it...

so maybe is there any way like i can specify that first column is 10% or 1em or whatever units that can make this colum just as big/wide the content inside it... and for another will be automatically spread to fill the rest of column size?