Уменьшить рамку шахматной доски CSS

table.CHESS
  {
    border-collapse: collapse;
  }
 
  table.CHESS td
  {
    width: 50px;
    height: 50px;
    border: solid gray 1px;
  }
 
 
.CHESS tr:nth-child(even) td:nth-child(odd), tr:nth-child(odd) td:nth-child(even) {
    background: black
}   
 
 
.CHESS tr:first-child, tr:last-child, td:first-child, td:last-child { 
    background: palegreen !Important
}
 
 
.CHESS tr:first-child td:nth-child(even), tr:last-child td:nth-child(odd) {
    background: palegreen !Important
}

.CHESS {
  border-collapse: collapse;
}
 
.CHESS td {
  width: 50px;
  height: 50px;
  border: solid gray 1px;
}
 
.CHESS tr:nth-child(even) td:nth-child(odd),
.CHESS tr:nth-child(odd) td:nth-child(even) {
  background: black;
}
 
.CHESS tr:first-child,
.CHESS tr:last-child,
.CHESS td:first-child,
.CHESS td:last-child {
  background: palegreen !important;
}
 
.CHESS tr:first-child td:nth-child(even),
.CHESS tr:last-child td:nth-child(odd) {
  background: palegreen;
}
 
.CHESS tr:first-child td,
.CHESS tr:last-child td {
  height: 25px;
}
 
.CHESS td:first-child,
.CHESS td:last-child {
  width: 25px;
}