<%= wicked_pdf_stylesheet_link_tag "bootstrap.css" -%>
            <%= wicked_pdf_stylesheet_link_tag "style.css" -%>
            <%= wicked_pdf_stylesheet_link_tag "styleUmowa.css" -%>
            <%= wicked_pdf_stylesheet_link_tag "animate.css" -%>
            <%= wicked_pdf_javascript_include_tag "application" %>

<div class="container">
   <div class="row">
       <div class="col-lg-4"></div>
       <div class="col-lg-4"></div>
       <div class="col-lg-4"></div>
   </div>
</div>

$snappy->setOption('viewport-size','1280x1024');

<div class="container">
   <div class="row d-table-row">
       <div class="col w-25 d-table-cell"></div>
       <div class="col w-25 d-table-cell"></div>
       <div class="col w-25 d-table-cell"></div>
       <div class="col w-25 d-table-cell"></div>
   </div>
</div>