bootstrap tag input define css code example
Example 1: input with bootstrap
<form>
<div class="form-group">
<label for="exampleInputEmail1">Email address</label>
<input type="email" class="form-control">
<small id="emailHelp" class="form-text text-muted">Hello, World</small>
</div>
</form>
Example 2: boostrap input tag
<input class="form-control form-control-lg" type="text" placeholder=".form-control-lg">
<input class="form-control" type="text" placeholder="Default input">
<input class="form-control form-control-sm" type="text" placeholder=".form-control-sm">