print.css

body {
  margin: 1em;
  background-color: #fff;
}
[dir="rtl"] body {
  direction: rtl;
}
th {
  text-align: left; /* LTR */
  color: #006;
  border-bottom: 1px solid #ccc;
}
[dir="rtl"] th {
  text-align: right;
}
tr:nth-child(odd) {
  background-color: #ddd;
}
tr:nth-child(even) {
  background-color: #fff;
}
td {
  padding: 5px;
}

File

core/misc/print.css

body {
  margin: 1em;
  background-color: #fff;
}
[dir="rtl"] body {
  direction: rtl;
}
th {
  text-align: left; /* LTR */
  color: #006;
  border-bottom: 1px solid #ccc;
}
[dir="rtl"] th {
  text-align: right;
}
tr:nth-child(odd) {
  background-color: #ddd;
}
tr:nth-child(even) {
  background-color: #fff;
}
td {
  padding: 5px;
}