How Can we change the Width of Input filters of Columns in Data-tables

beginner_2018

Dear All,

I input filters are very big in my Jquery data table. I had added the below line ,But I find no luck .
Can any one please do let me know what is the issue.

      "columnDefs": [{ "width": "12%", "targets": 1 }],

beginner_2018

thead select {
width: 70%;
}