A div with a fixed width will most likely have the CSS property "width" set on the container element. This is in contrast to the default "width" property of "auto" which sizes the container to fit the content inside.
To specify a fixed width on a div, use the following syntax in CSS:
div {
width: <width in pixels or percentage>
}
For example, if you wanted your div to be 300px wide, you'd use this code:
div {
width: 300px;
}
For a div that is 50% of its parent container's width, use this code:
div {
width: 50%;
}
If you are going to use a fixed width container, it's important to make sure that the width you specify is equal to or greater than the width of the content inside it.
I hope this helps! Feel free to comment if you need more information.