flutter/dev/docs/styles.html

<!-- style overrides for dartdoc -->
<style>
@import 'https://fonts.googleapis.com/css?family=Roboto:500,400italic,300,400,100i';
@import 'https://fonts.googleapis.com/css?family=Material+Icons';
</style>

<link href="../assets/overrides.css" rel="stylesheet" type="text/css">

<!-- The following rules are from http://google.github.io/material-design-icons/ -->
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<style>
  /* Rules for sizing the icon. */
  .material-icons.md-18 { font-size: 18px; }
  .material-icons.md-24 { font-size: 24px; }
  .material-icons.md-36 { font-size: 36px; }
  .material-icons.md-48 { font-size: 48px; }

  /* Rules for using icons as black on a light background. */
  .material-icons.md-dark { color: rgba(0, 0, 0, 0.54); }
  .material-icons.md-dark.md-inactive { color: rgba(0, 0, 0, 0.26); }

  /* Rules for using icons as white on a dark background. */
  .material-icons.md-light { color: rgba(255, 255, 255, 1); }
  .material-icons.md-light.md-inactive { color: rgba(255, 255, 255, 0.3); }
</style>