
The parent element in which flex items are contained
Defined using the flex or inline-flex values of the display property
flex: will make the flex-container a block-level element
inline-flex: will make the flex-container an inline element
The axis along which the flex items follow each other
flex-direction property determines the main axis
If the flex-direction is row or row-reverse then the main axis will be along the horizontal plane and the cross axis will be along the vertical plane
If the flex-direction is column or column-reverse then the main axis will be along the vertical plane and the cross axis will be along the horizontal plane