Paste this into a saved bookmark:
covfefe.css
javascript:(function()%7Bs%20%3D%20document.createElement('link')%3Bs.rel%3D'stylesheet'%3Bs.href%3D'https%3A%2F%2Frawgit.com%2FLukyVj%2Fcovfefe.css%2Fmaster%2Fcovfefe.css'%3Bdocument.body.appendChild(s)%7D)()
covfefe-background.css
javascript:(function()%7Bs%20%3D%20document.createElement('link')%3Bs.rel%3D'stylesheet'%3Bs.href%3D'https%3A%2F%2Frawgit.com%2FLukyVj%2Fcovfefe.css%2Fmaster%2Fcovfefe-background.css'%3Bdocument.body.appendChild(s)%7D)()
covfefe-ultime.css
javascript:(function()%7Bs%20%3D%20document.createElement('link')%3Bs.rel%3D'stylesheet'%3Bs.href%3D'https%3A%2F%2Frawgit.com%2FLukyVj%2Fcovfefe.css%2Fmaster%2Fcovfefe-ultime.css'%3Bdocument.body.appendChild(s)%7D)()
And enjoy:
