Rails HTML表：标签不做任何事情

Question

<% @user.workstations.each do |ws| %>
  <tr class="red">
    <td class="td_workstation"> <%= ws.name %> </td>
    <td class="td_workstation"> <%= ws.applications %> </td>
  </tr>
<% end %>

“红色”类应该使背景变红，但它不会做任何事情。为什么不影响行??????

.red {
  background: red;
  font-size: 60px;
}

.td_workstation, .th_workstation {
border: 1px solid #dddddd;
}

Answer 1

尝试将样式表更改为.red类：

tr.red td {
  background-color: red;
  border-collapse:collapse; //Throw this border-collapse in if you want to remove the white margins around each cell after you change the background.
  font-size: 60px;
}