@terrestris/vectortiles/src/styles/style-countries.js

A simple library that makes use of free available world-wide terrestris vectortiles in MapBox MVT format from OpenStreetMap data

export const style_countries = [{
  'minResolution': 0,
  'maxResolution': 99999,
  'style': {
    '': {
      'strokeColor': '#7d887d',
      'strokeWidth': 2,
      'strokeOpacity': 0.5,
      'fillColor': '#f2efe9',
      'useLabels': false,
      'zIndex': -2
    }
  }
}];