<div class="container-fluid">


    <div class="row">
        <div class="col-xs-12 col-md-12">
            <h2>Wiki-random: <button id="random" class="btn btn-default  btn-sm">Random</button> </h2>

        </div>
        <div class="col-xs-6 col-md-4"><input id="buscar" type="text" name="search" />
<label> Busca tu articulo</label>
            <button id="lupa" class="btn btn-default btn-sm">Eureka!</button></div>

    </div>






    <div class="row">
        <div class="col-sm-1"></div>

        <div class="col-sm-10">
            <div id="main" class="item">..........................</div>
        </div>
        <div class="col-sm-1"></div>
    </div>


</div>