Answer:
.row {
position: relative;
Clear: both;
Width: 100%;
}
Explanation:
A cascaded style sheet is a web development tool used to design of personalize the page layout of a web page on a device. The style sheet can be in-line css on the HTML file or a new style sheet file is created and linked to the HTML file.
It syntax comprises of a selector, an attribute and the value of the attribute. Class and id are examples of selectors in css.
In the code the div class is made relative to it's container and the margin on both sides are cleared, before it is made to fill up the entire width of the container.