Disable text selection highlighting using CSS

noselect.css

/* http://stackoverflow.com/a/4407335/3479278 */

.noselect {
  -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Chrome/Safari/Opera */
     -khtml-user-select: none; /* Konqueror */
       -moz-user-select: none; /* Firefox */
        -ms-user-select: none; /* Internet Explorer/Edge */
            user-select: none; /* Non-prefixed version, currently
                                  not supported by any browser */
}