With Bootstrap, only two media queries are used for styling the navbar.
1) The first one is for screens less than 767px wide.
2) The second media query targets screens with a minimum width of 768px.
Within the second media query, which applies to screens larger than 768px, the CSS sets the height of the navbar to auto !important. This is done because the navbar-right element is floated to the right side of the navbar. As the browser window shrinks, the navbar-right element moves down automatically, causing the overall height of the navbar to adjust accordingly. To achieve a smooth transition effect during this resizing, it's recommended to specify a fixed height rather than using 'auto', which would result in no visible transition effect.