Change the default width of a VuetifyJS DataTable cell

You can set width with header like below

headers: [
  { text: 'Dessert (100g serving)', value: 'name', width: '20%'},
  { text: 'Calories', value: 'calories', width: '50%' },
  { text: 'Fat (g)', value: 'fat' },
  { text: 'Carbs (g)', value: 'carbs', width: '200px' },
],