bootstrap 4 material input code example
Example: mdb input bg
<!-- Material background input -->
<div class="md-form md-bg">
<input type="text" id="formBg1" class="form-control">
<label for="formBg1">Example label</label>
</div>
<!-- Material background input -->
<div class="md-form md-bg">
<input type="text" id="formBg1" class="form-control">
<label for="formBg1">Example label</label>
</div>