problem se zobrazenim na ruznych monitorech

<style>
#main {position: absolute; width: 750px; height: 70%; top: 8%; left: 20%; font-family: Verdana;}
#main {background-color: white; color: green;}

#obr {position: absolute; width: 750px; height: 13%; top: 78%; left: 20%;}
#obr {background-color: white;}

#under {position: absolute; width: 750px; height: 3%; top: 91%; left: 20%; font-family: Verdana;}
#under {background-color: #008000;color: white;}
#under a:link {color: white;}
#under a:visited {color: white;}
#under a:hover {color: white;}
</style>