Put automatically generated side-by-side icons in javascript / HTML

I would like you to stand side by side. Every time the client uploads the contract, it stays horizontal. I would like to stay upright.

Followthecode:

vartxt="";

if (json.code == 1) {
   $(json.data).each(function () {  
       txt += '<div class="center" id="link-Contrato">'
       txt += '<a class="link-pop-up red" href="#" data-url="' + this.urlcontrato + '" data-width="10px"><i style="font-size: 24pt;" class="fa fa-file-pdf-o"></i></a><br>';
       txt += '    <span><a class="link-pop-up" target="_blank" href="' + this.urlcontrato + '">Contrato</a></span><br><br>'
       txt += '    <span><strong>' + this.tipo_contrato + '</strong></span><br>'

       if (this.detalhamento == "") {
          txt += ''
       } else {
          txt += '    <span><strong>' + this.detalhamento + '</strong></span><br>'
       }
       txt += '    <span><strong>' + this.data_upload + '</strong></span><br>'
       txt += '</div></div><br>'
   });

   } else {
       txt += '<span>Nenhum histórico encontrado.</span>';
   }
   $('#link-Contrato').html(txt);
},