Bootstrap 3 - Row Fixed Issue - asp.net-mvc

Question

I am strugling with Bootstrap 3 grid system.
Let me explain what I have implemented, what I need and what I did (fail attempt) to achieve.
This is the Layout (HTML | Razor) of the image. For you to have a live version of this This is the site link to this screen so you can see it and play.
<div class="row">
<div class="col-xs-12 col-md-6 nopadding">
<div id="showcaseSection" class="showcaseSection superVideo">
<ul class="media-list" id="showcaseMedia" itemscope itemtype="http://schema.org/UserComments"></ul>
</div>
<div class="hidden-xs">
<div class="col-xs-6 nopadding">
<p class="text-center no-margin" style="margin-top: 15px;">
<span>Equipo: #Model.Team1Name (<span id="team1Total">0</span>)</span>
</p>
<ul class="media-list team1ListShowCase" id="#Model.Team1Id" data-img="#Url.Action("GetLinkToImageTeam", "Home", new {Id = Model.Team1Id})" data-media="media-left" data-team="#Model.Team1Name" data-class="team1"></ul>
</div>
<div class="col-xs-6 nopadding">
<p class="text-center no-margin" style="margin-top: 15px;">
<span>Equipo: #Model.Team2Name (<span id="team2Total">0</span>)</span>
</p>
<ul class="media-list team2ListShowCase" id="#Model.Team2Id" data-img="#Url.Action("GetLinkToImageTeam", "Home", new {Id = Model.Team2Id})" data-media="media-right" data-team="#Model.Team2Name" data-class="team2"></ul>
</div>
</div>
</div>
<div class="col-xs-12 col-md-6">
<div class="col-xs-12 col-md-6 nopadding">
<div id="chatcontainer">
<ul class="media-list" id="chatbody" itemscope itemtype="http://schema.org/UserComments"></ul>
<div id="chatOptions" class="collapse">
<p class="text-center">#Model.Title</p>
<button id="exitroom" class="btn btn-danger" title="Salir" disabled="disabled">
<span class="glyphicon glyphicon-log-out"></span> #Resources.Salir
</button>
<span>
<input type="checkbox" id="isAutoscroll" name="my-checkbox" checked>
<label>Actualizar Mensajes</label>
</span>
</div>
</div>
#if (!Model.IsReadOnly)
{
<div class="input-group">
<input type="hidden" style="display: none" class="form-control" aria-required="false" readonly id="inresponseto">
<textarea type="text" rows="2" class="form-control" required="required" aria-required="true" maxlength="500" placeholder="Comentario..." disabled="disabled" id="responseText"></textarea>
<input type="text" class="form-control" style="height: 25px;" aria-required="false" readonly id="inresponsetomessage">
<span class="input-group-btn">
<button id="sendresponse" type="button" title="Enviar" class="btn btn-primary" disabled="disabled">
<span class="glyphicon glyphicon-send"></span>
</button>
<button class="btn btn-info" data-toggle="collapse" title="Opciones" data-target="#chatOptions">
<span class="fa fa-cogs"></span>
</button>
</span>
</div>
}
</div>
</div>
As you can see everything is in one row.
I want to have the Video Section fixed on top and the TEXT AREA to comment fixed BOTTOM when on XS (viewports).
I tried adding this to the row, but I fix the video but I cannot see the TEXT AREA
.fixed2 {
position: fixed;
z-index: 10;
width: 100%;}
I don't know what else to do to show fixed top (video) and botton fixed (Chat Textbox) and scrollable comments in the middle when in XS.
Any help is welcome.

Answer 1

Override the height for #chatcontainer for tablet/mobile will fix the issue. Example:
#media(max-width: 767px) {
#chatcontainer{
height: calc(50vh - 80px);
}
}