styles.css

/*
  normalize.css
  The next few lines are not relevant for Flexbox.
*/

article,aside,details,figcaption,figure,footer,header,hgroup,nav,section,summary{display:block;}audio,canvas,video{display:inline-block;}audio:not([controls]){display:none;height:0;}[hidden]{display:none;}html{font-family:sans-serif;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%;}a:focus{outline:thin dotted;}a:active,a:hover{outline:0;}h1{font-size:2em;}abbr[title]{border-bottom:1px dotted;}b,strong{font-weight:700;}dfn{font-style:italic;}mark{background:#ff0;color:#000;}code,kbd,pre,samp{font-family:monospace, serif;font-size:1em;}pre{white-space:pre-wrap;word-wrap:break-word;}q{quotes:\201C \201D \2018 \2019;}small{font-size:80%;}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline;}sup{top:-.5em;}sub{bottom:-.25em;}img{border:0;}svg:not(:root){overflow:hidden;}fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em;}button,input,select,textarea{font-family:inherit;font-size:100%;margin:0;}button,input{line-height:normal;}button,html input[type=button],/* 1 */
input[type=reset],input[type=submit]{-webkit-appearance:button;cursor:pointer;}button[disabled],input[disabled]{cursor:default;}input[type=checkbox],input[type=radio]{box-sizing:border-box;padding:0;}input[type=search]{-webkit-appearance:textfield;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box;}input[type=search]::-webkit-search-cancel-button,input[type=search]::-webkit-search-decoration{-webkit-appearance:none;}textarea{overflow:auto;vertical-align:top;}table{border-collapse:collapse;border-spacing:0;}body,figure{margin:0;}legend,button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0;}

/*
  Box-sizing
  This set's the box-sizing for the complete document to border-box.
  Not directly relevant to Flexbox.
*/

* { box-sizing: border-box; }

*::before,
*::after { box-sizing: inherit; }


/*
  Default styles
  Here we layout some grounds to work with Flexbox.
*/

body {
  color: #fff;
  font-family: sans-serif;
  text-align: center;
  font-size: 4em;
}

[class^="flex-item"] {
  padding: 2rem;
  width: 20%;
  overflow: hidden;
  display: flex;
  /*justfiy-content: center;*/
}

.flex-item01 { background-color: #DC3522; }

.flex-item02 { background-color: #D9CB9E; }

.flex-item03 { background-color: #374140; }

.flex-item04 { background-color: #2A2C2B; }

.flex-item05 { background-color: #1E1E20; }

.flex-item06 { background-color: #DC3522; }

.flex-item07 { background-color: #D9CB9E; }

.flex-item08 { background-color: #374140; }

.flex-item09 { background-color: #2A2C2B; }

.flex-item10 { background-color: #1E1E20; }

.flex-container {
  height: 100vh;
  /* We will start writing Flexbox in here */
  display: flex;
}