Why is page scrolling missing when using Bootstrap's .tab-content?

Question

css

Good day.
A small remark: I am far from web development, I write applications for the "thick" Lotus Domino client. Because lately there is nothing much to do at work, the boss gave me the task of "poking around" in Twitter Bootstrap and SmartAdmin - Responsive WebApp. In general terms, I can imagine what HTML and CSS are, but I may not know many elementary things. Please understand and forgive)
About the problem ... There is a certain form with three tabs. On the first tab, a lot of all sorts of labels and inputs are crammed. In the end, they go beyond the bottom of the screen and you can see their contents only by switching Tab. Maybe there is some kind of limitation? The nesting of tags is as follows:

<div id="myTab1Content" class="tab-content padding-10">
    <div id="s1" class="tab-pane fade active in">
        <form class="form-horizontal" name="formService">
            <fieldset>
                <div class="form-group">
                    <label class="col-md-3 control-label">№ сервиса</label>

                    <div class="col-md-9">
                        <input class="form-control" type="text" placeholder="-1">
                    </div>
                </div>
            </fieldset>
        </form>
    </div>
</div>

PS: The situation is repeated in Mozilla, Chrome. I have not tried it in others, and it probably does not make sense.

Answer 1

What about CSS?
The only thing that now comes to mind is that for html and / or body it is set:
overflow: hidden;