Css-Why cannot I use the php.net "FiraMono" font on my webpage?

When reading the php.net document, I found that the English font (& quot; FiraMono & quot;) on the page was pretty nice, but it turned into my own webpage. What is the reason? (The same computer and the same browser)

When reading the php.net document, I found that the English font ("Fira Mono") on the page is pretty nice,

However, my own web pages have become frustrated. What is the reason? (The same computer and the same browser)

Reply content:

When reading the php.net document, I found that the English font ("Fira Mono") on the page is pretty nice,

However, my own web pages have become frustrated. What is the reason? (The same computer and the same browser)

There is no such font in your system. In addition, Your webpage does not introduce such font files. You need to download the font file of this font to the public folder of your website, and then reference it through css.
@ Font-face {
Font-family: 'fira Sans ';/Here is the name of the called font./
Src: url (here your font file location is written );/Here is the font file path/
}

Keyword "WebFont"

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