..

app/assets/stylesheets/application.scss

@@ -278,7 +278,7 @@ footer {
   color: #FFF;
 
   .main {
-    background-color: #313131;
+    background-color: #E6E6E6;
     padding: 16px 0px 0px 0px;
     min-height: 256px;
   }
@@ -577,3 +577,8 @@ input.chk {
 .button-save-setup{
   height: 35px; width: 110px; color:white; background-color: #1676bc;
 }
+
+.logos-footer{
+  height: 70px;
+  width: auto;
+}

app/views/shared/application/_footer.html.erb

 <footer>
-
     <div class="footer-bar">
         <div class="row">
           <div class="col-md-offset-5 col-md-4">
@@ -14,33 +13,32 @@
         </div>
       </div>
 
-  <div class="main" style="background-color: #E6E6E6;">
+  <div class="main">
     <div class="container" style="min-height: 200px;">
-
       <div class="col-md-12" style="padding-top: 50px">
         <div class="logo-footer">
         <%= link_to 'http://www.brasil.gov.br/' do %>
-          <%= image_tag 'logo_brasil.png', style: 'width: auto;	height: 70px;' %>
+          <%= image_tag 'logo_brasil.png',class:'logos-footer' %>
         <% end %>
       </div>
       <div class="logo-footer">
         <%= link_to 'http://www.fnde.gov.br/' do %>
-          <%= image_tag 'logo_ministerio.png', height: '70', style: 'width: auto;	height: 70px; margin-left: 18%;' %>
+          <%= image_tag 'logo_ministerio.png',class:'logos-footer', style: ' margin-left: 18%;' %>
         <% end %>
       </div>
         <div class="logo-footer">
         <%= link_to 'http://www.fnde.gov.br/' do %>
-          <%= image_tag 'fnde.png', height: '70', style: 'width: auto;	height: 100px; margin-top: -8%;' %>
+          <%= image_tag 'fnde.png', style: 'width: auto;	height: 100px; margin-top: -8%;' %>
         <% end %>
         </div>
         <div class="logo-footer">
         <%= link_to 'http://www.ufpr.br/portalufpr/' do %>
-          <%= image_tag 'logo_ufpr.jpg', height: '100', style: 'width: auto;	height: 70px;'%>
+          <%= image_tag 'logo_ufpr.jpg',class:'logos-footer'%>
         <% end %>
         </div>
         <div class="logo-footer">
         <%= link_to 'http://www.c3sl.ufpr.br/' do %>
-          <%= image_tag 'logo_c3.png', style: 'width: auto;	height: 70px;'%>
+          <%= image_tag 'logo_c3.png', class:'logos-footer'%>
         <% end %>
       </div>
       </div>