CSS-Why can't I use the php.net "Fira Mono" font for my page?

When looking at the Php.net document, I found the English font of the page ("Fira Mono") pretty good,

But put it on my own web page and it gets down. What is the reason, please? (same computer, same browser)

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When looking at the Php.net document, I found the English font of the page ("Fira Mono") pretty good,

But put it on my own web page and it gets down. What is the reason, please? (same computer, same browser)

There's no such font in your system. And your Web page does not introduce font files of this font. You need to download the font file to the public folder of your website and then use the CSS reference.
@font-face {
font-family: ' Fira Sans '; / Here is the name of the font that describes the call
Src:url (Write your font file location here); / Here is the font file path /
}

Keyword "Webfont"

Related CSS Http://php.net/cached.php?t=1415938827&f=/fonts/Fira/fira.css

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