JSFiddle - React, Tailwind, and code Playground

HTML

<div class="pagina">

<div id="cabecera">

<div id="logo">

      <img src="http://www.revistaunimevonline.com/img/cab/back2_r1_c2.jpg" />

</div><!-- cierro logo-->

<div class="form1" id="fr1">
  Formulario
 </div><!--cierro caja formulario-->

</div><!-- cierro cabecera -->

</div>

CSS

#cabecera{
width:100%;
background:url(http://www.revistaunimevonline.com/img/cab/back2_r1_c1.jpg
) repeat-x;
overflow:hidden;}

#logo{float:left;
margin: 0 10px;    
}

#fr1{
width:150px;
height:150px;
bacground-color:#a8f7e5;
float:right;
border:2px solid #000;}