th, td {
  border: 1px solid #444; /* inner cell borders */
  padding: 12px 15px;
  vertical-align: top;
}

.collapse table{width: 80%;}
.collapse table th{font-weight: 600;width: 50%;}
#scroll ul.roman li {list-style-type: lower-roman;}
.collapse table tr > colspan {text-align: center;}