Here is the input field of my form:

its functioning well but not displaying correctly
Here is my code:
<div class="form-group">
<label for="datepicker">Expire Date</label>
<div class="form-group">
<div class="input-group date-select-with-expire-option">
<div class="input-group-prepend">
<span class="input-group-text"> <i
class="far fa-calendar-alt"></i>
</span>
</div>
<input type="text" class="form-control date-input"
name="SelectedDate" placeholder="Select date" />
<div class="input-group-append">
<div class="input-group-text">
<div class="custom-control custom-checkbox">
<input type="checkbox" class="custom-control-input expire-option"
name="DateNeverExpires" id="never-expired"> <label
class="custom-control-label" for="never-expired"> Never
expires </label>
</div>
</div>
</div>
</div>
</div>
</div>
Here the same code in jsFiddle working fine. but not on my page
I don't know where I am making mistake.
Thanks in anticipation