html {display:table;margin:auto;}
body {display:table-cell;background-color:ivory; color:black;}
h1      {text-align:center;font-family:Helvetica,Arial,sans-serif; color:#006400;font-size:150%;}   
h2      {text-align:center;font-family:Helvetica,Arial,sans-serif; font-size:120%;}
h3      {text-align:center;font-family:Helvetica,Arial,sans-serif; font-size:110%; margin-top:0px;margin-bottom:0px;}
h4      {font-family:Helvetica,Arial,sans-serif; font-size:100%; margin-top:0px;margin-bottom:0px;}
p       {text-align:justify; font-family:Helvetica,Arial,sans-serif;}
li      {text-align:justify; font-family:Helvetica,Arial,sans-serif; font-size:100%;}