3x-ui/frontend/src/components/DateTimePicker.css

.jdp-wrap {
  width: 100%;
}

.jdp-wrap > * {
  width: 100%;
}

.jdp-wrap input {
  direction: ltr;
  text-align: left;
  unicode-bidi: plaintext;
}

.jdp-dark .jdp-wrap input,
.jdp-dark input {
  color: rgba(255, 255, 255, 0.88) !important;
  background-color: #23252b !important;
}

.jdp-ultra .jdp-wrap input,
.jdp-ultra input {
  color: rgba(255, 255, 255, 0.88) !important;
  background-color: #101013 !important;
}

.jdp-dark input::placeholder,
.jdp-ultra input::placeholder {
  color: rgba(255, 255, 255, 0.30) !important;
}

.jdp-disabled {
  pointer-events: none;
  opacity: 0.6;
}