body{
  margin:40px auto;
  max-width:800px;
  line-height:1.6;
  font-family: "Open Sans", Arial;
  font-size:18px;
  color:#444;
  padding:0 10px;
}

h1,h2,h3{
  line-height:1.2;
}

img {
  width: 100%;
  height: auto;
}

table.centered {
  margin-left:auto;
  margin-right:auto;
}