How to change the text color of a Vuetify button?

There are css classes for coloring text anywhere in vuetify, just append --text to a color.
So for example

<v-btn class="red--text">

It should work with colors defined in your theme as well e.g. primary--text and similar.
Note that this is not specific to a v-btn, class should work anywhere.

If you are using vuetify you may seems like to apply this as a standard color:

import Vue from "vue";
import Vuetify from "vuetify";
import "vuetify/dist/vuetify.min.css";
    
Vue.use(Vuetify);
    
export default new Vuetify({
  theme: {
    themes: {
      light: {
        primary: "#14C6FF",
        secondary: "#424242",
        accent: "#82B1FF",
        error: "#FF5252",
        info: "#2196F3",
        success: "#4CAF50",
        warning: "#FFC107",
        lightblue: "#14c6FF",
        yellow: "#FFCF00",
        pink: "#FF1976",
        orange: "#FF8657",
        magenta: "#C33AFC",
        darkblue: "#1E2D56",
        gray: "#909090",
        neutralgray: "#9BA6C1",
        green: "#2ED47A",
        red: "#FF5c4E",
        darkblueshade: "#308DC2",
        lightgray: "#BDBDBD",
        lightpink: "#FFCFE3",
        white: "#FFFFFF"
      }
    }
  }
});

and can be easily access using color="lightpink" prop or whatever you like.