body { font-family:sans-serif }
.month {
  display:grid;
  grid-template-columns: 120px repeat(31, 1fr);
  border-bottom:1px solid #ccc;
}
.day {
  border-left:1px solid #ddd;
  min-height:40px;
  font-size:10px;
}
@media print {
  button, input { display:none }
}