/*
  cpt-city: cb/seq/Greys_03 (cpt)

  Harrower, M., & Brewer, C. A. (2003). ColorBrewer.org:
  An online tool for selecting colour schemes for maps.
  Cartographic Journal, 40(1), 27-37.

  author: Cynthia Brewer, Mark Harrower
  copyright: Apache-style
  year: 2002
  url: https://phillips.shef.ac.uk/pub/cpt-city/cb/seq
*/
linear-gradient(
  0deg,
  rgb(240, 240, 240)   0.000%,
  rgb(240, 240, 240)  33.333%,
  rgb(189, 189, 189)  33.333%,
  rgb(189, 189, 189)  66.667%,
  rgb( 99,  99,  99)  66.667%,
  rgb( 99,  99,  99) 100.000%
);