This code is commonly used in WordPress sites to ensure that the content within the HTML and body elements does not exceed the width of the viewport or parent container. By setting the maximum width to 100%, the content will automatically adjust and fit within the available space.
The overflow-x property is set to “hidden” to hide the horizontal scroll bar. This is useful when the content is designed to be displayed within the visible area and scrolling horizontally is not intended or necessary. It provides a cleaner and more streamlined user experience by preventing the appearance of unnecessary scroll bars.