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CSS Layout - clear and clearfix


The clear Property
When we use the float property, and we want
the next element below (not on right or left), we will have to use the clear
property.
The clear property specifies what
should happen with the element that is next to a floating element.
The clear property can have one of the
following values:

none - The element is not pushed below
left or right floated elements. This is default
left - The element is pushed below left
floated elements
right - The element is pushed below
right floated elements
both - The element is pushed below both
left and right floated elements
inherit - The element inherits the clear value
from its parent

When clearing floats, you should match the clear to the float: If an element
is floated to the left, then you should clear to the left. Your floated element
will continue to float, but the cleared element will appear below it on the web
page.

Example
This example clears the float to the left. Here, it means that the <div2>
element is pushed below the left floated <div1> element: 

div1 {  float: left;}div2 {  clear: left;}
Try it Yourself »


The clearfix Hack
If a floated element is taller than the containing element, it
will "overflow" outside of its container. We can then add a clearfix hack to
solve this problem:



Without Clearfix



With Clearfix




Example

.clearfix {  overflow: auto;}
Try it Yourself »

The overflow: auto clearfix works well as long as you are able to keep control of your margins and padding (else you
might see scrollbars). The
new, modern clearfix hack however, is safer to use, and the following code is used for most webpages:

Example

.clearfix::after {  content: "";  clear: both;  display: table;}
Try it Yourself »


You will learn more about the ::after pseudo-element in a later chapter.













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Reference: https://www.w3schools.com/css/css_float_clear.asp