Visual Studio code Alternative to Operator Mono

settings.json

{
    "workbench.iconTheme": "vscode-icons",
    "editor.rulers": [80], 
    "editor.fontFamily": "FiraCode-Retina",
    "editor.fontLigatures": true,
    "editor.fontSize": 12.5,
    "vscode_custom_css.imports": [
        "file:///Users/pbrunache/Desktop/fonts/styles.css"
    ]
}

styles.css

/* This really depends on whatever theme you're using
* The font-style italic is really flottflott font family but saved as
* FiraCode the link to download is below.
* https://www.dropbox.com/s/7ov2o3ibrqczqkb/FiraCode-Italic.ttf?dl=0
* If the link above doesn't work, just download from: 
* http://www.dafont.com/flottflott.font
* and rename it FiraCode-Italic.ttf
*/
.vs-dark .mtk15 {
    font-weight: 100;
    font-style: italic;
}