.ai {background-color: silver; overflow: auto; height: 100%; left: 0px; position: absolute; top: 0px; width: 850px}

.bi {background-color: white; overflow: hidden;position: relative;  float: right; height: 100%; top: 0px; width: 120px}

.debi {background-attachment: fixed; overflow: hidden; left: 25px; height: 620px; position: absolute; top: 0px; width: 970px;}

 body{overflow: hidden;background-attachment: fixed}