go to your style.css in web folder.
body {
max-width: 680px;
font-family: Monospace;
font-size: 16px; /* reset, specified in px so IE currentStyle works */
background-color: #3B3131;
color: white;
margin: 8px auto;
padding: 0 8px;
that’s my file put in font family your type letter .
You can get many font style about your game fonts at fonts for Instagram.