User CSS to remove the static header from websites

metafilter.css

/* If you know how to edit User CSS using a browser plugin, use http://*.metafilter.com/* as the URLs for this CSS. */
header.site-header.fixed.visible {
  display: none !important;
}

slate.css

/* If you know how to edit User CSS using a browser plugin, use http://*.slate.com/* as the URLs for this CSS. */
header.with-dropdown {
  display: none !important;
}

the-new-yorker.css

/* If you know how to edit User CSS using a browser plugin, use http://*.newyorker.com/* as the URLs for this CSS. */
.sticky #hd {
  display: none !important;
}

twitter.css

/* 
  If you know how to edit User CSS using a browser plugin, use http://twitter.com/* as the URLs for this CSS.
  This is for the canopy that I only see in a full-screen-mode browser, or maybe if my screen is wide enough.
*/
.ProfileCanopy.ProfileCanopy--withNav.is-locked {
  display: none !important;
}

wired.css

/* 
  If you know how to edit User CSS using a browser plugin, use http://*.wired.com/* as the URLs for this CSS.
*/
header.hr-unpinned {
  display: none !important;
}