#start-date {
  width: 100%;
}

#start-date .SingleDatePicker,
#start-date .SingleDatePickerInput,
#start-date .DateInput,
#start-date .DateInput_input {
  width: 100% !important;
  box-sizing: border-box;
}

#start-date .DateInput_input {
  padding: 8px 10px;
  font-family: 'Segoe UI', 'Helvetica Neue', sans-serif;
}