table.scroll {
  width: 100%; /* Optional */
  border-spacing: 0;
}
table.scroll tbody,
table.scroll thead { 
  display: block; 
}
table.scroll thead tr {
  width: 100%;
  display: block;
  float: left;
  height: 42px;
}
table.scroll thead tr th {
  float: left;
  display: block;
}
table.scroll tbody {
  float: left;
  max-height: 256px;
  overflow-y: auto;
  overflow-x: hidden;
}
table.scroll tbody tr td {
  float: left;
  height: 45px;
}