css in md in github

1<!--
2if you want to use css in your README file but don't want the css to show up
3as raw text when looking at the README in github you can put it in a summary 
4and the make the summary transparent using css
5-->
6<details>
7  <summary id = "css">css is disabled in this preview</summary>
8  
9<style>
10#css{
11    color: rgba(0,0,0,0.0);
12}
13/*css goes here*/
14</style>
15</details>
16