As of two speakers to make one in bootstrap 4. What would the contents of the two columns became one?

As of two speakers to make one in bootstrap 4. What would the contents of the two columns became one?
5afecf13c1733667463243.png
<div class="row">
 <div class="col-3 col-sm-2">
 <div class="header-elem">
 <div class="header-elem_img">
 <img src="img/header/logo.png" alt="logo.png" class="logo-header">
</div>
 <!-- /.header-elem_img --> 
</div>
 <!-- /.header-elem -->
</div>
 <!-- /.col-3 -->

 <div class="col-3 col-sm-3">
 <div class="header-elem">
 <div class="header-elem_img">
 <img src="img/header/mark.png" alt="mark.png" class="mark-header">
</div>
 <!-- /.header-elem_img -->
 <div class="header-elem_text">
 <p class="address-header">
 Moscow,<br> Aviamotornaya ulitsa, 4A
</p>
 <!-- /.address-header -->
</div>
 <!-- /.header-elem_text -->
</div>
 <!-- /.header-elem -->
</div>
 <!-- /.col-3 -->

 <div class="col-3 col-sm-4">
 <div class="header-elem__right">
 <div class="header-elem_img">
 <img src="img/header/convert.png" alt="convert.png" class="convert-header">
</div>
 <!-- /.header-elem_img -->
 <div class="header-elem_text">
 <p class="mail-header"><a href="mailto:info@maketstorent.ru"></a>info@maketstorent.ru</p>
 <!-- /.mail-header -->
</div>
 <!-- /.header-elem_text -->
</div>
 <!-- /.header-elem -->
</div>
 <!-- /.col-3 -->

 <div class="col-3 col-sm-3">
 <div class="header-elem__right2">
 <div class="header-elem__right2-text">
 <p class="phone-header">+7 (495) 008-55-77</p>
 <a class="link" href="#">Book dummy parts</a>
 <!-- /.phone -->
</div>
 <!-- /.header-elem_img --> 
</div>
 <!-- /.header-elem_text -->
</div>
 <!-- /.col-3 -->
</div>
 <!-- /.row -->
June 5th 19 at 21:02
1 answer
June 5th 19 at 21:04
if straight Budapeste, then:
col3 -- *COL6* -- col3
*COL6* inside:
row > col6 -- col-6
and these col-6 can be converted to col12 and they will become one under the other
And how you can still? well, if not budreski. - rudolph commented on June 5th 19 at 21:07
well you still need a wrapper over red col-3, in which they will occupy for 50% or 100% percent.
By the way question is not clear, you need to turn them in one column on all resolutions or only on some breakpoint? - Fatima commented on June 5th 19 at 21:10
from 768px 576px until I need to turn in one column. - rudolph commented on June 5th 19 at 21:13

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