add font otf to css code example

Example 1: otf css3 font-face

@font-face {
    font-family: GraublauWeb;
    src: url("path/GraublauWeb.otf") format("opentype");
}

Example 2: css how to embed fonts

/************* How to embed fonts using GOOGLE FONTS? ******************
This will ensure that the Font type of your choice will appear for all 
users, regardless of whether or not they have this Font installed!


1º -  Go to https://fonts.google.com/


2º - Choose a Font and, for that particular choice, you mark the option: 
     "Select this style". Do this for every Font you wish to incorporate


3º - In the page of your "Selected Family", go to the option "Embed"


4º - Copy the link and paste in the <header> of your html file: */
<link href="https://fonts.googleapis.com/css2?family=..." 
  rel="stylesheet"> /*


5º - Finish by copying the "CSS rules to specify families" that the site 
gives you and (in your css file) pasting a new property to your element, 
for exemple: */

h1 {
  font-family: "Sacramento", cursive;
}