<%= button_tag type: 'submit', class: "" do %>
<i class="fas fa-search"></i>
<% end %>
<%= button_tag type:'submit' do %>
<i class="fas fa-plus-circle"></i>
<% end %>
<%= button_tag type: 'submit', class: "button my-button", id: "register-button" do %>
<i class="fa fa-lock" aria-hidden="true"></i>
<% end %>