Bootstrap 4 Toggle left to right expand -


i have been looking @ bootstrap 4 documentation want toggle div shrink , expand left right found toggle toggle expands @ top.

here found:

<div class="pos-f-t">   <div class="collapse" id="navbartoggleexternalcontent">     <div class="bg-dark p-4">       <h4 class="text-white">collapsed content</h4>       <span class="text-muted">toggleable via navbar brand.</span>     </div>   </div>   <nav class="navbar navbar-dark bg-dark">     <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbartoggleexternalcontent" aria-controls="navbartoggleexternalcontent" aria-expanded="false" aria-label="toggle navigation">       <span class="navbar-toggler-icon"></span>     </button>   </nav> </div>

how can left right expand when button clicked?


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