bottom centered upload button for MediaWiki

/* show "read" tab on MonoBook */
body.skin--responsive #p-cactions li#ca-view,#ca-view { display: inline; }

/* highlight upload button */
#n-uploadbtn {
  background-color: green;
  background-image: linear-gradient(lightgreen,green);
  border-radius: 10px;
  padding-left: 1em;
}
#n-uploadbtn a { color: white; }

/* unneeded */
#t-ajaxquickdelete { display: none; }

/* bottom centered upload button */
#n-uploadbtn {
    position: fixed;
    left: 50%;
    bottom: 1em;
    list-style: none;
    padding-right: 1em;
    z-index: 2;
}