How to leave a responsive element [closed]

I'm having problems with an element on my site, it stays normal on my computer, but at smaller resolutions (cell phones), it's not responsive.

Below are some prints:

How are you at Computer: (Right)

HowareyouontheMobile:(WRONG!)

How do you HAVE to stay on the Mobile: (Absolutely!)

Iwantittolooklikethe3rdPrint.

Followthecode:

HTML:

<divclass="buscar_dominio">
<div class="tamanho">
    <div class="esquerdo">      
        <div class="buscar_secao">        
        <form method="post" id="dominio-form-busca">
        <input type="hidden" name="direct" value="true">
        <div class="www"><label for="s" class="www-texto">www.</label></div>       
        <div>
        <input class="input" name="domain" id="s" value="Insira seu domínio aqui" onfocus="if (this.value == 'Insira seu domínio aqui') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Insira seu domínio aqui';}" type="text" style="margin-bottom: 0px;">
        <select class="witch" name="ext">
            <option value=".com">.com</option>
            <option value=".net">.net</option>
            <option value=".org">.org</option>
            <option value=".com.br">.com.br</option>
            <option value=".net.br">.net.br</option>
            <option value=".in">.in</option>
            <option value=".me">.me</option>
            <option value=".info">.info</option>
            <option value=".biz">.biz</option>
            <option value=".us">.us</option>
            <option value=".name">.name</option>
            <option value=".cc">.cc</option>
            <option value=".ws">.ws</option>
            <option value=".mobi">.mobi</option>
            <option value=".tv">.tv</option>
            <option value=".co">.co</option>
            <option value=".br.com">.br.com</option>
            <option value=".xxx">.xxx</option>
        </select>
        <input id="botao-busca" value="Buscar" type="submit"> 
        </div>
        </form>        
        </div>        
        <div class="clearfix"></div>        
        <div class="sm_links"><a href="#">Tabela de Preços</a>  | <a href="#">Pesquisa de Domínios em Massa</a> | <a href="#">Transferir Domínio</a> | <a href="#">Promoções</a></div>        
    </div>
    <div class="bg-transparente"><ul><li> Aqui irá ficar o título</li><li class="titulo">Aqui ficará o sub-título</li><li class="porque">Mussum ipsum cacilds, vidis litro abertis. Consetis adipiscings elitis. Pra lá , depois divoltis porris.</li></ul></div>    
    <div class="direito">       
        <ul>
            <li>.COM<em>Apenas</em> R$ 22,90/ano</li>
            <li class="promo">.ORG<em>De <s>R$ 27,90</s> por</em> R$ 13,90/ano</li>
            <li>.NET<em>Apenas</em> R$ 19,90/ano</li>
            <li>.COM.BR<em>Apenas</em> R$ 34,90/ano</li>
        </ul>        
    </div>
</div>
</div>

CSS:

body{font:normal 14px arial;}

a {text-decoration:none; }

.buscar_dominio {
    float: left;
    width: 100%;
    background:#EEE; }

.buscar_dominio .esquerdo {
    float: left;
    width: 54%;
    padding: 16px 0px 5px 0px; }

.buscar_dominio .direito {
    width: 57%;
    min-height: 90px;
    padding: 20px 0px 16px 0px; }

.buscar_dominio .bg-transparente {
    float: right;
    width: 43%;
    min-height: 90px;
    padding: 25px 0 0 0;
    font:normal 28px "Trebuchet MS", Arial, Helvetica, sans-serif;
    text-align:center;
    color: #000; }

.buscar_dominio .porque {
    font:normal 13pt Arial;
    width:90%;
    margin:10px 0px 0px 7%;
    color: #333;
    text-align:center; }

.buscar_dominio .titulo {
    font-size: 20px;
    font-family:Tahoma, Geneva, sans-serif;}

.buscar_dominio .esquerdo .buscar_secao {
    float: left;
    width: 95%;
    margin-left: 15px;
    padding: 1.4% 1.6%;
    background: #fff;
    border-radius: 4px;
    border: 1px solid #E0E0E0; }

#dominio-form-busca { margin: 0; padding: 0; }

#dominio-form-busca #s{
    border: 1px solid #fff;
    border-left: 1px solid #F5F5F5;
    width: 45%;
    height:30px;
    padding:7px 10px 7px 10px;
    color: #393a3b;
    float: left;
    border-radius: 0px;
    font-size: 16px;
    background-color: #f3f3f3; }

.www {
    border: 1px solid #fff;
    width: 8%;
    height:30px;
    margin-right: -1px;
    text-align: center;
    padding:7px 10px 7px 10px;
    color: #393a3b;
    float: left;
    border-radius: 4px 0px 0px 4px;
    font: normal 14px arial;
    background-color: #FFEB00; }

.www-texto {
    margin-top:4px;
    cursor:default;
    font-size:14pt; }

.buscar_dominio .esquerdo .buscar_secao .witch {
    float: left;
    width: 100px;
    height: 44px;
    font-size: 16px;
    color: #393a3b;
    padding: 10px 10px 10px 10px;
    margin: 1px 0px 0px -10px;
    border: none;
    border-radius: 0px 4px 4px 0px;
    background-color: #FFEB00; }

.buscar_dominio .esquerdo .buscar_secao #botao-busca{
    float: right;
    width: 90px;
    height: 44px;
    margin-top: 1px;
    text-align: center;
    cursor:pointer;
    overflow:hidden;
    color: #fff;
    font: normal 16px tahoma;
    text-transform: uppercase;
    background: #004897;
    border-radius: 4px;
    -webkit-transition: 0.2s;
    -moz-transition: 0.5s;
    -ms-transition: 0.5s;
    -o-transition: 0.5s;
    transition: 0.5s; }

.buscar_dominio .esquerdo .sm_links {
    float: left;
    margin-left: 15px;
    color: #999;
    font-size: 13px;
    margin-top: 5px; }

.buscar_dominio .esquerdo .sm_links a {
     color: #999; }

.buscar_dominio .esquerdo .sm_links a:hover {
     color: #0099FF; }

.buscar_dominio .direito ul {
     padding: 0px;
    margin-right: 15px; }

.buscar_dominio .direito li {
    float: left;
    padding: 10px 8px 13px 8px;
    margin: 0px 0px 15px 15px;
    width: 100px;
    background-color: #fff;
    border-radius: 4px;
    font-size: 11pt;
    color: #393a3b;
    text-align: center;
    border: 1px solid #DBDBDB; }

.buscar_dominio .direito li em {
    font-size: 12px;
    color: #727272;
    font-style: normal;
    display: block;
    line-height: 16px; }

.buscar_dominio .direito s { color: #C30; }

.buscar_dominio .direito .promo { color: #00AC00; }

ul li {list-style: none;}

JSFiddle