Assuming that you're using the latest Bootstrap 3, you just need to add the form-control
class to your inputs and it will override the datepicker's yellow outline. I also wrapped the inputs inside `col-md-3' since Bootstrap 3 no longer defines a specific width for inputs.
<div class="input-append date ">
<div class="col-md-3">
<label>Arrival Date</label>
<input name="arrival" class="form-control datepicker" data-date-format="dd/mm/yyyy" id="checkin" placeholder="click here">
</div>
</div>
<div class="input-append date">
<div class="col-md-3">
<label>Outgoing Date</label>
<input name="outgoing" class="form-control datepicker" data-date-format="dd/mm/yyyy" id="checkout" placeholder="click here">
</div>
</div>
EDIT:
For Bootstrap 2.x just make sure you add type="text"
to your inputs and it will show the blue outline. I've update the Bootply.