1. A computer-implemented method for providing a focus-on-content (FOC) mode for a content page, the computer-implemented method comprising: receiving, at a computer, the content page comprising a content portion and a plurality of other portions, the content page configured in a first state; receiving, at the computer, Cascading Style Sheets (CSS) code defining a CSS style as an ancestor of an interface element in the content page, the CSS style corresponding to a class name, and the CSS code configured to transform the content page from the first state to a second state, the second state placing a greater focus on the content portion and placing a reduced focus on the plurality of other portions than the first state; inserting, at the computer, the CSS code defining the CSS style into a Hypertext Markup Language (HTML) structure of the content page; receiving, at the computer, a user selection of a FOC mode button in the content page; responsive to receiving the user selection of the FOC mode button, enabling the FOC mode and transforming the content page by inserting the class name into a HTML element of the content page, and transforming the content page from the first state to the second state in accordance with the CSS code; receiving, at the computer, a second selection of the FOC mode button; and responsive to receiving the second selection of the FOC mode button, disabling the FOC mode and transforming the content page by removing the class name from the HTML element of the content page, and transforming the content page from the second state to the first state.