default.css

body {
  font-family: "DejaVu Sans","Noto Sans CJK SC","Helvetica Neue",Helvetica,Arial,sans-serif;
  font-size: 14px;
  line-height: 1.42857143;
  color: #333;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' width='650px' height='500px'><text transform='translate(50, 300) rotate(-30)' fill='rgba(122,122,122,0.07)' font-size='48' font-family='DejaVu Sans,Helvetica Neue,Helvetica,Arial,sans-serif'>CONFIDENTIAL</text></svg>");
}

pre {
  display: block;
  padding: 9.5px;
  margin: 0 0 10px;
  line-height: 1.42857143;
  font-family: "DejaVu Sans Mono",monospace;
  font-size: 10px;
  color: #333;
  word-break: break-all;
  word-wrap: break-word;
  white-space: pre-wrap;
  background-color: #f5f5f5;
  border: 1px solid #ccc;
  border-radius: 4px;
}

table {
  border-spacing: 0;
  border-collapse: collapse;
  border: 1px solid #ddd;
}

table>tbody>tr>td,
table>tbody>tr>th,
table>tfoot>tr>td,
table>tfoot>tr>th,
table>thead>tr>td,
table>thead>tr>th {
  border: 1px solid #ddd;
}

td {
  padding: 10px;
}

h1 {
  text-align: center;
}

img {
  width: 100%;
}