.contents_table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 1.3rem;
  background: #fafafa;
}
.contents_table th,
.contents_table td {
  border: 1px solid #ddd;
  padding: 0.8em 1em;
  text-align: left;
}
.contents_table th {
  background: #f0f0f0;
  font-weight: bold;
  width: 30%;
}
.contents_table tr:nth-child(even) {
  background: #f9f9f9;
}