Final answer:
To add the specified CSS styles for a mobile viewport, include style rules for 'section', 'article', and 'aside' elements with the provided color, margin, and padding values within a style tag or CSS file.
Step-by-step explanation:
To add style rules for the mobile viewport in CSS, you will need to write appropriate style declarations inside a style tag or a CSS file. In your case, you want to set specific styles for the section, article, and aside elements. Here's how you can do it:
section {
background-color: #183440;
color: #fff;
margin-top: 4%;
padding: 3%;
}
article {
margin-top: 1%;
padding: 2%;
}
aside {
background-color: rgba(24, 52, 64, 0.3);
padding: 2%;
margin-top: 1%;
color: #183440;
box-shadow: 4px 4px 10px #183440;
}
Make sure to include these style rules in the appropriate section of your CSS, which could be within a media query if these styles are only meant for mobile viewports.