dcat-admin2/resources/assets/dcat/sass/components/_datetimepicker.scss

.datetimepicker table tr td.active, .datetimepicker table tr td.active:hover, .datetimepicker table tr td.active.disabled, .datetimepicker table tr td.active.disabled:hover,
.datetimepicker table tr td span.active, .datetimepicker table tr td span.active:hover, .datetimepicker table tr td span.active.disabled, .datetimepicker table tr td span.active.disabled:hover{
  background-image: linear-gradient(to bottom, $primary, $primary) !important;
}
.datetimepicker td, .datetimepicker th {
  padding: 4px;
}

.datetimepicker {
  padding: 10px 14px!important;
  border: 1px solid $divider-color!important;
  box-shadow: $shadow;
};