<%= form_for(@meeting) do |f| %>
  <% if @meeting.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@meeting.errors.count, "error") %> prohibited this meeting from being saved:</h2>

      <ul>
      <% @meeting.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <table>
    <tr class="field">
      <th><%= f.label :date %></th>
      <td><%= f.date_field :date, class: 'form-control' %></td>
    </tr>
    <tr class="field">
      <th><%= f.label :description %></th>
      <td><%= f.text_area :description, height: '6', class: 'form-control' %></td>
    </tr>
    <tr class="actions">
      <td colspan='2'><%= f.submit %></td>
    </tr>
  </table>
<% end %>

<%= form_for(@meeting) do |f| %>
  <% if @meeting.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@meeting.errors.count, "error") %> prohibited this meeting from being saved:</h2>

      <ul>
      <% @meeting.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <table>
    <tr class="field">
      <th><%= f.label :date %></th>
      <td><%= f.date_field :date, class: 'form-control' %></td>
    </tr>
    <tr class="field">
      <th><%= f.label :description %></th>
      <td><%= f.text_area :description, height: '6', class: 'form-control' %></td>
    </tr>
    <tr class="actions">
      <td colspan='2'><%= f.submit class: 'btn btn-success' %></td>
    </tr>
  </table>
<% end %>

Add class to submit button to make it green like the other buttons
Add class to submit button to make it green like the other buttons
