How to change standard form in Bootstrap?

Please tell me how in standard form with a dropdown menu in Bootstrap is to replace the button-arrow on the icon without a button? In the end, I want the form look like a button with a dropdown menu, but with the functions option and select.
July 9th 19 at 14:01
2 answers
July 9th 19 at 14:03
You should have a code thrown, so it is difficult to say. In General extend the bootstrap class, which define what this button, no arrows. Get a customized bootstrap without affecting its source code.
Thanks for the reply, but I'm new and for me it is difficult. And code like this:

UAH (Hryvnia)USD (Dollar)EUR (Euro)RUR (Ruble)
If you can tell me. - Zack89 commented on July 9th 19 at 14:06
July 9th 19 at 14:05
Standard code
<div class="currency1 col-md-12 col-sm-12 col-xs-12">
 <select class="form-control" id="currency">
 <option>UAH (Hryvnia)</option>
 <option>USD (Dollar)</option>
 <option>EUR (Euro)</option>
 <option>RUR (Ruble)</option>

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