Typora user config (goes in %USERPROFILE%\Roaming\Typora\conf\conf.user.json) & base theme css (goes in %USERPROFILE%\Roaming\Typora\themes)

conf\conf.user.json

/** 
Typora user config 
C:\Users\hava\AppData\Roaming\Typora\conf\conf.user.json */
{
  "width" : null, // Integer - Window's width in pixels. Default is null (last window width)
  "height" : null, // Integer - Window's height in pixels. Default is null (last window height)
  "directWrite": true, // Boolean - Enables DirectWrite font rendering system on Windows. Default is true.
  "defaultFontFamily": {
    "standard": null, //String - Defaults to "Times New Roman".
    "serif": null, // String - Defaults to "Times New Roman".
    "sansSerif": 'Roboto Sans', // String - Defaults to "Arial".
    "monospace": 'Droid Sans Mono' // String - Defaults to "Courier New".
  },
  "autoHideMenuBar": true, //Boolean - Auto hide the menu bar unless the `Alt` key is pressed. Default is false.

  // Array - Search Service user can access from context menu after a range of text is selected. Each item is formatted as [caption, url]
  "searchService": [
    ["Search with Google", "https://google.be/search?q=%s"],
    ["Search with Kay", "https://www.kaybodywear.com/catalogsearch/result/?q=%s"]
  ],

  // Custom key binding, which will override the default ones.
  "keyBinding": {
    "Always On Top": "Ctrl+Shift+P",
    "Insert Local Images": "Ctrl+Shift+I",
    "Code Fences": "Ctrl+Shift+K",
    "Code": "Ctrl+K",
    "Hyperlink": "Ctrl+L",
    "Highlight": "Ctrl+H"
  },

  "autoSaveTimer" : 2 // default 5 minutes
}

themes\base.user.css

@import url('https://fonts.googleapis.com/css?family=Droid+Sans+Mono|Roboto+Mono');
@import url('https://fonts.googleapis.com/css?family=Roboto');

.md-fences,
code,
tt {
    font-family: 'Droid Sans Mono', Consolas, "Liberation Mono", Courier, monospace;
/*
font-family: 'Roboto Mono', monospace;
*/
    font-size: 0.9em;
}