codex.docs/src/frontend/styles/vars.pcss

:root {
  --color-text-main: #1D202B;
  --color-text-second: #7B7E89;
  --color-line-gray: #E8E8EB;
  --color-link-active: #388AE5;

  /**
   * Site layout sizes
   */
  --layout-padding-horisontal: 40px;
  --layout-padding-vertical: 40px;
  --layout-width-aside: 250px;
  --layout-width-main-col: 650px;

  --button {
    display: inline-block;
    background:  var(--color-link-active);
    color: #fff;
    border-radius: 3px;
    padding: 9px 15px;
    font-size: 14px;
    line-height: 1em;

    svg {
      margin: 0 0.3em 0 -0.05em;
    }

    &:hover {
      background: color-mod(var(--color-link-active) blackness(+10%));
    }
  }
}