bootstrap col-12

Bootstrap col-12 is a grid system class that defines a column that spans across the full width of the container. It is used to create a full-width element in the Bootstrap grid system. When you add the class "col-12" to an element, it will take up the full width of the container, regardless of the size of the screen. You can also use this class to create a full-width row by adding it to a div element that contains multiple columns.