/*
  cpt-city: cb/seq/Greys_09 (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(255, 255, 255)   0.000%,
  rgb(255, 255, 255)  11.111%,
  rgb(240, 240, 240)  11.111%,
  rgb(240, 240, 240)  22.222%,
  rgb(217, 217, 217)  22.222%,
  rgb(217, 217, 217)  33.333%,
  rgb(189, 189, 189)  33.333%,
  rgb(189, 189, 189)  44.444%,
  rgb(150, 150, 150)  44.444%,
  rgb(150, 150, 150)  55.556%,
  rgb(115, 115, 115)  55.556%,
  rgb(115, 115, 115)  66.667%,
  rgb( 82,  82,  82)  66.667%,
  rgb( 82,  82,  82)  77.778%,
  rgb( 37,  37,  37)  77.778%,
  rgb( 37,  37,  37)  88.889%,
  rgb(  0,   0,   0)  88.889%,
  rgb(  0,   0,   0) 100.000%
);