html, body {
  background: #ffffff;
  font-family: Arial, Helvetica Neue, Helvetica, sans-serif;
  margin: 10px;
  padding: 0px;
}

h1 {font-size: 1.6em;}
h2 {font-size: 1.4em;}
h3 {font-size: 1.2em;}

.main {
  background: white;
  max-width: 1000px;
  margin: auto;
  overflow: auto;
  padding: 0px;
}