[Vuejs]-Vuetify datatable How to override the styling

Try to use the !important suffix after your property value in CSS.

For Example :
If the Default style of your `h1 element is :

h1{
  color: red;
}

You would need to override the default color with the color you want (red in this case) using !important.
Your code to look like this :

h1{
  color: red!important;
}

I hope it works!