body {
  color: black;
  background-color: white;
  font-size: 0.875em;
  font-family: Arial, Helvetica, sans-serif;
}
table {
  background-color: #f8f9fa;
  font-size: 88%;
  border: 1px solid #a2a9b1;
}
h1 {
  font-family: 'Linux Libertine','Georgia','Times',serif;
  font-weight: normal;
  border-bottom: 1px solid #a2a9b1;
}
h2, h3 {
  font-family: 'Linux Libertine','Georgia','Times',serif;
  font-weight: normal;
  font-size: 1.5em;
  border-bottom: 1px solid #a2a9b1;
}
img { 
  border: 1px solid black;
}
.doi {
  font-size: x-small;
}
.center {
  text-align: center;
}