discourse/app/views/users/perform_account_activation.html.erb

<div id='simple-container'>
  <%if flash[:error]%>
    <div class='alert alert-error'>
      <%=flash[:error]%>
    </div>
  <%else%>
    <div class='activate-account'>
      <h1 class="activate-title"><%= t 'activation.welcome_to', site_name: SiteSetting.title %> <img src="<%= Emoji.url_for("wave") %>" alt="" class="waving-hand"></h1>
      <br>
      <div class='perform-activation'>
        <div class="image">
          <img src="<%= Discourse.base_path + '/images/wizard/tada.svg' %>" alt="tada emoji" class="waving-hand">
        </div>
        <% if @needs_approval %>
          <p><%= t 'activation.approval_required' %></p>
        <% else %>
          <p><%= t('activation.please_continue') %></p>
          <p><a class="btn" href="<%= path "/" %>"><%= t('activation.continue_button', site_name: SiteSetting.title) -%></a></p>
          <%- content_for(:no_ember_head) do %>
            <%= tag.meta id: 'data-auto-redirect', data: { path: path('/') } %>
          <%- end %>
          <%= preload_script 'auto-redirect' %>
        <% end %>
      </div>
    </div>
  <%end%>
</div>