One of the major problems with the structure of HTML is that if you have a child div inside parent div, the child div automatically flows around the parent div. The solution to this problem is using clear property of CSS.
Bootstrap allows us to use a class named clearfix which is used to clear the floated contents inside any container.
Example 1: Without clearfix property. In the below program two buttons are floated to left and right.
Clearfix property clear all the floated content of the element that it is applied to. It is also used to clear floated content within a container.
Example 2: With clearfix property. Without using the clearfix class, the parent div may not wrap around the children button elements properly and can cause a broken layout.