html {
  box-sizing: border-box;
  font-size: 16px;
}

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

 body {
		margin: 0;
		padding: 1rem;
		font-family: system-ui, helvetica, tahoma, verdana, sans-serif;
		font-size: 1rem;              /* 16px */
		line-height: 1.6;
		color: #222;
		background-color: #f7f7f7;
		flex-flow: row wrap;
      }

img {
			max-width: 100%;
			height: auto;
	}	  
		
header, nav, nav a, article, footer {
        border-style: outset;
        padding: 10px;
        margin: 10px;
        flex: 1 100%;
      }
 
header {
        background: #f0f0f0;
        border-color: #d5d5d5;
        text-align: center;
		font-family: helvetica, tahoma, verdana, sans-serif;
		font-size: 150%;
	  }
	  
header * {
        flex: 1 1 0%;
      }
     
article {
        background: #eadbc8;
        border-color: #d5d5d5;
		font-family: helvetica, tahoma, verdana, sans-serif;	
		text-align: center;
      }
 
article {
        flex: 3 1 0%;
      }
	  
a {
  color: #0057b8;
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}