как мне это сделать?Я пытался плавать правильно, но это не сработало.Почему?
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<div class="dropdown float-right">
<button class="btn btn-secondary dropdown-toggle bg-success " type="button"
id="dropdownMenuButton" data-toggle="dropdown"><i class="fas fa-user"></i></button>
<div class="dropdown-menu dropdown-menu-right" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Profile</a>
<a class="dropdown-item" href="#">Change Password</a>
<a class="dropdown-item" href="log in.html">Log out</a>
</div>
</div>