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                <div class="wrap">
  <div class="block">
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla eu cursus est. Duis pulvinar ante sed felis consequat tincidunt. Morbi augue odio, pellentesque vitae justo sit amet, fermentum rutrum quam. Donec sed mi porttitor velit sodales cursus. Integer aliquet faucibus consequat. Quisque a lorem sit amet orci posuere pellentesque. Praesent varius elit sed orci ultricies semper quis dignissim nunc. Integer tempus est lobortis purus tincidunt porta. Pellentesque laoreet molestie eros non iaculis. Nullam leo nisi, faucibus et turpis vel, posuere euismod erat. Donec sit amet bibendum augue. Nam ut eleifend lorem. In congue pulvinar enim sed iaculis. 


                body {
.wrap {
  background: white;
.block {
	background: #254365;
		linear-gradient(135deg, transparent 10px, #254365 0) top left,
		linear-gradient(225deg, transparent 10px, #254365 0) top right,
		linear-gradient(315deg, transparent 10px, #254365 0) bottom right,
		linear-gradient(45deg,  transparent 10px, #254365 0) bottom left;
	background-size: 50% 50%;
	background-repeat: no-repeat;