Can we add a style that's responsive for mobile? Add a class to main.css.

Example:

```css
.tour .header h1 {
  /*color: #555;*/
  font-weight: 200;
  font-size: 46px;
  line-height: 51px;
}
@media (max-width: 767px) {
  .tour .header h1 {
    font-size: 25px;
    line-height: 35px;
  }
}
```