Flex horizontal scroll

1. How do I make a horizontal page scrollable?
2. How do I scroll wheel horizontally?

How do I make a horizontal page scrollable?

Horizontal scrolling can be achieved by clicking and dragging a horizontal scroll bar, swiping sideways on a desktop trackpad or trackpad mouse, pressing left and right arrow keys, or swiping sideways with one's finger on a touchscreen.

How do I scroll wheel horizontally?

You can move the contents of windows that have horizontal scroll bars to the left or right using the keyboard and the mouse. Move contents to the right: Press the Shift key and scroll the mouse wheel up. Move contents to the left: Press the Shift key and scroll the mouse wheel down.