<!doctype html>
<html>
<head>
<style>
  code {
      font-family:"DejaVuSansMono YaHei NF";
      border-radius: 14px;
      font-size: 10px;
  }
  pre {
  	margin: 0.1em 0;	
  }
  .maincode {
      font-size: 14px; 
  }
  h2, h3, h4 {
  	font-family:"Cambria Math", monospace;	
  }
  
  .collapse {
  	transition: all 1s ease;
	visibility: visible;	
	display: block;
	overflow: hidden;
	padding: 10px;
  }
  
  .collapse.closed{
  	transition: all 1s ease;
	visibility: hidden;
  }
</style>
<link rel="styleshee