Right way to manage inline controls (might involve bootstrap)?

I have a piece of html that produces form controls and I want them lined up on the same line. I think I have no choice but use these block-level tags in order to skin them with bootstrap.

   <div class="container" style="width: 100%; background: #4e4e4e; height: 177px; color: #fff;">
        <form name="input" action="demo_form_action.asp" method="get" style="margin-top: 16px; height: 155px;">
            <div class="input-group"
                 style="margin-left: 100px; width: 200px;">
                <input type="text" name="user" placeholder="Username:" class="form-control">
                <span class="input-group-addon flat">
                    <i class=" glyphicon glyphicon-user">
                    </i>
                </span>
            </div>
            <select class="btn btn-default dropdown-toggle" name="Days" 
          			data-toggle="dropdown" style="margin-left: 20px;">
                <option value="0">Days</option>
                <option>1</option>                <option>2</option>                <option>3</option>
            </select>
            <div class="btn-group btn-block row">
                <button type="button" class="btn btn-default" style="margin-left: 20px;">Default</button>
                <button type="button" class="btn btn-default dropdown-toggle"
                        data-toggle="dropdown">
                    <span class="caret"></span>
                    <span class="sr-only">Toggle Dropdown</span>
                </button>
                <ul class="dropdown-menu" role="menu">
                    <li><a href="#">Action</a></li>
                    <li><a href="#">Another action</a></li>
                    <li><a href="#">Something else here</a></li>
                    <li class="divider"></li>
                    <li><a href="#">Separated link</a></li>
                </ul>
            </div>
            <input type="submit"
                   value="Check Files"
                   style="margin-left: 20px;"
                   class=" btn btn-default btn-primary">
        </form>
    </div>

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This renders to:
blocks.png
I spent a lot of time getting it to look better using Float but I suspect there is a better way and one that will give me less grief for responsive. I want it to look like this:

row.png
I want the block of controls to center and, if the windows shrinks, THEN they can start stacking. But I want them on a line when there is room.  Is there a better way than float? Should I be using the bootstrap grid somehow? A toolbar?  Btn-block? This seems like such a straightforward thing that I suspect I might need to take things out rather than add things in.

What's the RIGHT way to inline and center these?
Kenny HoptonAsked:
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GaryCommented:
Remove btn-block and row from the default dropdown block

Change your username block to
<div style="margin-left: 100px; width: 200px;" class="col-xs-1">
  <div class="input-group">
                <input type="text" name="user" placeholder="Username:" class="form-control">
                <span class="input-group-addon flat">
                    <i class=" glyphicon glyphicon-user">
                    </i>
                </span>
  </div>
            </div>

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Kenny HoptonAuthor Commented:
Thanks Gary. Giant improvement over the float workaround. I can work with this.

Was the
class="col-xs-1"

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the only thing that can work or does it just have to be a narrow width div?

I'll close this shortly but was hoping to understand it a little better while this question gives us a place to follow up.
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GaryCommented:
That just floats it, you may as well use the Bootstrap classes rather than writing your own.
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Kenny HoptonAuthor Commented:
Fast answer that works.
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