get rid of side walls with flex css code example

Example 1: css flexbox syntax

Display: flex 
Flex-direction: row | row-reverse | column | column-reverse
align-self: flex-start | flex-end | center | baseline | stretch
justify-content: start |  center | space-between | space-around | space-evenly

Example 2: flex css end

.item {
  align-self:flex-start | flex-end | center | baseline | stretch;
}