Flexbox
Cheat Sheet
#container {
    display: flex
    flex-direction: row /* (default) /*  /*justify-content: row align-items: column */
    flex-direction: column            /*justify-content: column align-items: row */
}
- flex-direction: row = main axis 
- flex-direction: column = main axis 
- justify = main axis 
- align = cross axis 
Right Click> Inspect (Open DevTools) > Click
flexbutton next to element
Styles Pane > Click icon next to
display:flexstyle to open editor
Reference: New CSS flexbox debugging tools
Example
index.html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Flexbox</title>
    <style>
      header {
        display: flex;
        justify-content: right;
        align-items: center;
        height: 200px;
      }
      div {
        height: 100px;
        width: 100px;
        border: 1px solid #ddd;
      }
    </style>
  </head>
  <body>
    <header>
      <div>Div 1</div>
      <div>Div 2</div>
      <div>Div 3</div>
      <div>Div 4</div>
      <div>Div 5</div>
      <div>Div 6</div>
    </header>
  </body>
</html>