body {
  background-color: #ffffff;
  font-family: sans-serif;
  font-size: 13px;
  }

a:link {
  color: #000080;
  }

a:active {
  color: #800000;
  }

a:visited {
  color: #008080;
  }

.head {
  font-size: 14px;
  font-weight: bold;
}

hr {
  height: 1px;
  border: none;
  border-top: solid 1px #333;
}

.abstract {
  margin-left: 50px;
  width: 600px;
  font-family: serif;
  font-size: 15px;
  
}