CSS

Fonts

@font-face

This is the method with the deepest support possible right now. The @font-face rule should be added to the stylesheet before any styles.

@font-face {
  font-family: 'MyWebFont';
  src: url('webfont.eot'); /* IE9 Compat Modes */
  src: url('webfont.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('webfont.woff2') format('woff2'), /* Super Modern Browsers */
       url('webfont.woff') format('woff'), /* Pretty Modern Browsers */
       url('webfont.ttf')  format('truetype'), /* Safari, Android, iOS */
       url('webfont.svg#svgFontName') format('svg'); /* Legacy iOS */
}

Practical Level of Browser Support:

@font-face {
  font-family: 'MyWebFont';
  src: url('myfont.woff2') format('woff2'),
       url('myfont.woff') format('woff'),
       url('myfont.ttf') format('truetype');
}

Then use it to style elements like this:

body {
  font-family: 'MyWebFont', Fallback, sans-serif;
}

https://css-tricks.com/snippets/css/using-font-face/