By default, the tag content is generally displayed in the input at the top of the input box:
Using floating tags, you can use the input insert a label in the input box and click input float them to the top when you enter the boxes
Note: 
7.36.1. Bootstrap instance ¶
<div class="form-floating mb-3 mt-3">
<input type="text" class="form-control" id="email" placeholder="Enter email" name="email">
<label for="email">Emaillabel>
div>
<div class="form-floating mt-3 mb-3">
<input type="text" class="form-control" id="pwd" placeholder="Enter password" name="pswd">
<label for="pwd">Passwordlabel>
div>