javascript:(function(){var color = prompt('text color');var bgcolor = prompt('bg color');var lkcolor = prompt('link color');var vstcolor = prompt('visit color');var newSS, styles='* { background:' + bgcolor + ' ! important; color: ' + color + '!important } :link, :link * { color:  ' + lkcolor + ' !important } :visited, :visited * { color: ' + vstcolor + ' !important }'; if(document.createStyleSheet) { document.createStyleSheet("javascript:'"+styles+"'"); } else { newSS=document.createElement('link'); newSS.rel='stylesheet'; newSS.href='data:text/css,'+escape(styles); document.getElementsByTagName("head")[0].appendChild(newSS); } })();