how to center bootsreap code example

Example 1: bootstrap 4 center div

<div class="d-flex justify-content-start">...</div>
<div class="d-flex justify-content-end">...</div>
<div class="d-flex justify-content-center">...</div>
<div class="d-flex justify-content-between">...</div>
<div class="d-flex justify-content-around">...</div>

Example 2: how to center a form in bootstrap

<div class="col-md-4 col-md-offset-4">my div here</div>

Example 3: bootstrap center button

<div class="text-center"> 
	 <button type="button">centered button</button>
</div>

Example 4: alighn right boostrap 4

<div class="float-left">Float left on all viewport sizes</div><br>
<div class="float-right">Float right on all viewport sizes</div><br>
<div class="float-none">Don't float on all viewport sizes</div>