body
{
   text-align: center;
   background-color: #eee;
}

.mainblock
{
   margin: 1em;
   border: 1px solid green;
   padding: 0.5em;
   background-color: #fff;
}

h1, h2, h3
{
   padding-top: 0; 
   margin-top: 0;
   color: #390;
}

h2
{
   border-bottom: 1px solid #390;
   margin-bottom: 0.3em;
}