1.Design your header

2.Design your table

  .container a:hover {
    color: #f55e55;
    text-decoration: none;
    background-color: rgba(255, 255, 255, 0);

3.add style to footer

4.add style to button

add these lines to app/assets/stylesheets/ideas.css.scss

   .container input[type="submit"] {
      height: 30px;
      font-size: 13px;
      background-color: #f55e55;
      border: none;
      color: #fff;

Coach explain how to use border in css, try modify the style of button like round the corner, add shadow or color etc.