The w3-left class floats an element to the left side of its container.
The following text flows beside the box while there is enough space, then continues below it.
Floating box
Resize the window to see how this paragraph flows around the floating box.
When the text reaches the bottom of the box, it can use the full width of the container again.
The w3-left class floats an element to the left.
The w3-right class floats an element to the right.