table#program {
  border: 3px solid #000000;
  text-align: left;
  border-collapse: separate;
  border-spacing:0;
  font-family: sans-serif;
  margin-left:auto;
  margin-right:auto;
}

table#program td {
  border: 1px solid black;
  padding:0.15em;
}

table#program td.program_authors {
  width:15em;
}

table#program td.program_session {
  font-family: serif;
  background-color:#fdffcd;
  }

table#program td.program_day {
  font-family: serif;
  font-weight: bold;
  text-align:center;
  background-color:#e0ffcd;
  }