The change modifies the `.avatar` class inside a narrow `message-list` media query, swapping `display: none` for explicit zero `height`, `padding`, and `margin` to preserve layout flow while visually hiding the element.
The change modifies the `.avatar` class inside a narrow `message-list` media query, swapping `display: none` for explicit zero `height`, `padding`, and `margin` to preserve layout flow while visually hiding the element.