Hide seconds when using datatype 3.byte time/day

[cdebackere]

Add this to Custom CSS:

Code:

.timepicker-day,
.timepicker-second {
  display: none;
}
.timepicker {
  margin: 10px 0;
  display: flex;
  justify-content: space-evenly;
}

I hoped to use this 'conditionally', so only on certain timepickers with an additional class,
but embedding this code in a construct like .hourMinPick {...} does not work. HOw should that be written?