How to stretch the menu accordion to the desired height?

Question

css

I'm using Bootstrap and this menu works fine - however the parent element is content-stretched and the accordion itself has the default bootstrap height. And I need it to align with the left block and behave proportionally with it when resized. I beg you, please help me to implement this, I have no thoughts with everything. I attached

a diagram of what is needed in the picture

. Here is the code -

col-xs-3 leftcontainer, this is the left container, and col-xs-9 completaccourdion, this is the right one.

<div class="col-xs-3 leftcontainer">
    <div class="row">
    
        <div class="contheader">Текст</div>
    <div class="imgcontleftcont">
    <div class="imgcontleftcont"><img src="images/logo.jpg"></div>
    <div class="dividerleftcont"></div>
    <div class="imgcontleftcont"><img src="images/logo.png"></div>
    <div class="dividerleftcont"></div>
    <div class="imgcontleftcont"><img src="images/logo.jpg"></div>
    </div>
        </div>
    </div>
    
<div class="col-xs-9 completaccourdion">
<div class="row">
        <div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
    <div class="contheader accodrion">Текст</div>
  <div class="panel panel-default useraacord">
    <div class="panel-heading useraccpanel" role="tab" id="headingOne">
      <h4 class="panel-title">
        <a data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
         Текст
        </a>
      </h4>
    </div>
    <div id="collapseOne" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingOne">
      <div class="panel-body">
    Текст
    <div class="accordbottomint">
    <div class="slidebutton">Подробнее</div>
    <div class="accordphotos"><img src="images/accordphoto.jpg"></div>
    </div>
      </div>
    </div>
  </div>
   <div class="panel panel-default useraacord">
    <div class="panel-heading useraccpanel" role="tab" id="headingTwo">
      <h4 class="panel-title">
        <a data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="true" aria-controls="collapseTwo">
        Текст
        </a>
      </h4>
    </div>
    <div id="collapseTwo" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingTwo">
      <div class="panel-body">
      Текст
    <div class="accordbottomint">
    <div class="slidebutton">Подробнее</div>
    <div class="accordphotos"><img src="images/accordphoto.jpg"></div>
    </div>
      </div>
    </div>
  </div>
  <div class="panel panel-default useraacord">
    <div class="panel-heading useraccpanel" role="tab" id="headingThree">
      <h4 class="panel-title">
        <a data-toggle="collapse" data-parent="#accordion" href="#collapseThree" aria-expanded="true" aria-controls="collapseThree">
         Текст
        </a>
      </h4>
    </div>
    <div id="collapseThree" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingThree">
      <div class="panel-body">
       Текст
    <div class="accordbottomint">
    <div class="slidebutton">Подробнее</div>
    <div class="accordphotos"><img src="images/accordphoto.jpg"></div>
    </div>
      </div>
    </div>
  </div>
   <div class="panel panel-default useraacord">
    <div class="panel-heading useraccpanel" role="tab" id="headingFour">
      <h4 class="panel-title">
        <a data-toggle="collapse" data-parent="#accordion" href="#collapseFour" aria-expanded="true" aria-controls="collapseFour">
        Текст
        </a>
      </h4>
    </div>
    <div id="collapseFour" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingFour">
      <div class="panel-body">
       Текст
    <div class="accordbottomint">
    <div class="slidebutton">Подробнее</div>
    <div class="accordphotos"><img src="images/accordphoto.jpg"></div>
    </div>
      </div>
    </div>
  </div>
</div>
    </div>
      </div>

Answer 1

.completaccourdion {
min-height: 300px;
}

Instead of 300, you need to adjust the value that suits you.

Answer 2

add a class to the parent element that will contain display: table, and to its children - to these columns, add a class that will contain display: table-cell.
very simple)