A simple CSS page watermark

This is a very quick one about watermarking a generic website.

via CSS only

Add the following snippet to your CSS and adjust if you want custom properties.

html:after {

  /* common custom values */
  content: "© Water Mark"; /* your site name */
  font-size: 720%;         /* font size */
  color: rgba(0, 0, 0, .1);
  /* alpha, could be even rgba(0,0,0,.05) */

  /* rest of the logic */
  z-index: 9999;
  cursor: default;
  display: block;
  position: fixed;
  top: 33%;
  right: 0;
  bottom: 0;
  left: 15%;
  font-family: sans-serif;
  font-weight: bold;
  font-style: italic;
  text-align: center;
  line-height: 100%;

  /* not sure about who implemented what ..
    ... so bring it all */
  -webkit-pointer-events: none;
  -moz-pointer-events: none;
  -ms-pointer-events: none;
  -o-pointer-events: none;
  pointer-events: none;

  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
  transform: rotate(-45deg);

  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  user-select: none;
}

via restyle({}) at runtime

Place restyle.js in scope, then:

restyle({
  'html:after': {

    /* common custom values */
    content: '"© Water Mark"',  /* show what ? */
    fontSize: '720%',           /* how big ? */
    color: 'rgba(0, 0, 0, .1)', /* how visible ? */

    /* rest of the logic */
    zIndex: '9999',
    cursor: 'default',
    display: 'block',
    position: 'fixed',
    top: '33%',
    right: 0,
    bottom: 0,
    left: '15%',
    fontFamily: 'sans-serif',
    fontWeight: 'bold',
    fontStyle: 'italic',
    textAlign: 'center',
    lineHeight: '100%',
    pointerEvents: 'none',
    transform: 'rotate(-45deg)',
    userSelect: 'none'
  }
});

I've quickly tested this even on Google Maps and it worked like a charm and I don't know yet how many browsers will support this CSS approach but it seems that all modern browsers are just fine.
Enjoy