react-datetime.css

.rdt {
  display: inline-block;
}

.rdtOpen .rdtPicker {
  display: block;
  position: absolute;
  width: 300px;
  z-index: 9999;
}

@media only screen and (max-width: 480px) {
 .rdtOpen .rdtPicker {
    position: fixed;
    width: 100%;
    max-width: 600px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
}

.rdtPicker {
  display: none;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,.1);
}

.rdtPicker table {
  border-spacing: 0;
  border: 0;
  border: none;
}

.dow {
  text-align: center;
}

.rdtPrev,
.rdtNext,
.rdtSwitch,
.rdtDay,
.rdtMonth,
.rdtYear {
  cursor: pointer;
  text-align: center;
}

.rdtDays,
.rdtYears {
  display: flex;
  flex-direction: row;
  height: 300px;
}

.rdtMonths {
  display: flex;
  flex-direction: column;
  height: 300px;
}

.rdtMonths table,
.rdtYears table {
  width: 100%;
  height: 100%;
}

.rdtDays table {
  width: 80%;
  height: 100%;
}

.rdtDays.rdtNoTime table {
  width: 100%;
  height: 100%;
}

.rdtYears table thead tr,
.rdtMonths table thead tr,
.rdtDays table thead tr {
  height: 40px;
  line-height: 40px;
}

.rdtYears table thead th,
.rdtMonths table thead th,
.rdtDays table thead th {
  vertical-align: middle;
}


.time-selector-container {
  width: 20%;
  overflow: scroll;
}

.time-selector-times {
  margin: 0;
  padding: 0;
  width: 100%;
  overflow: scroll;
  list-style-type: none;
}

.time-selector-time {
  cursor: pointer;
  padding: 4px 0;
  text-align: center;
}