b) Utilize an external CSS file for the following requirements: Assume the cells (Latest, Gadgets, Mobile & Artificial Intelligence) is the main navigation bar of the page (Refer Figure ). Use id selector named topnav and change the following properties: space around the content:20px color of the background: #AED6F1 the round corner for edges is 50px Use appropriate property to ensure when user scroll the page, the navigation bar will not be scrollable. It will stay in its position. Refer to Figure 4. Avoid output as shown in Figure 5. Tochnology Latest Gadgets Mobile Artificial Intelligence Figure 3 Navigation bar