Flags/UK.html

<!DOCTYPE html>
<html>
  <head>
    <title>United Kingdom | Flags</title>
    <style>
      #uk {
        width: 144px;
        height: 72px;
        background-color: #003399;
        /*
            Without ::before and ::after the flag is almost correct, but it
            doesn't alternate the position of the white St Andrew's Cross and
            the red St Patrick's Cross.
         */
        background-image: 
            linear-gradient(90deg, transparent, transparent 64.8px, 
                #CC0000 64.8px, #CC0000 79.2px,
                transparent 79.2px), 
            linear-gradient(180deg, transparent, transparent 24px, 
                white 24px, white 28.8px, 
                #CC0000 28.8px, #CC0000 43.2px,
                white 43.2px, white 48px,
                transparent 48px),
            linear-gradient(90deg, transparent, transparent 60px, 
                white 60px, white 84px,
                transparent 84px),
            linear-gradient(26.6deg, transparent, transparent 57.2px, 
                white 57.2px, white 64.6px,
                #CC0000 64.4px, #CC0000 69.2px,
                white 69.2px, white 71.6px,
                transparent 71.6px),
            linear-gradient(153.4deg, transparent, transparent 57.2px, 
                white 57.2px, white 64.4px,
                #CC0000 64.4px, #CC0000 69.2px,
                white 69.2px, white 71.6px,
                transparent 71.6px);
                
        box-shadow: 0px 0px 15px 2px #e5e5e5;
        position: relative;
      }
      #uk::before, #uk::after {
        content: "";
        position: absolute;
        display: block;
        top: 0;
        left: 0;
        width: 60px;
        height: 24px;
      }
      #uk::before {
        /* Overlay the top-left quadrant with the correct order of the crosses. */
        background-image:
            linear-gradient(26.6deg, transparent, transparent 14.3px, 
                white 14.3px, white 16.7px,
                #CC0000 16.7px, #CC0000 21.5px,
                white 21.5px, white 28.7px,
                transparent 28.7px);
      }
      #uk::after {
        /* Overlay the top-right quadrant with the correct order of the crosses. */
        left: 84px;
        background-image:
            linear-gradient(153.4deg, transparent, transparent 19.6px, 
                white 19.6px, white 22px,
                #CC0000 22px, #CC0000 26.8px,
                white 26.8px, white 34px,
                transparent 34px);
      }
    </style>
  </head>
  <body>
    <div id="uk"></div>
  </body>
</html>