.pattern {
height: 100%;
background-size: 115px 115px;
background-repeat: repeat;
background-image:
linear-gradient(225deg, transparent 136px, #555555 136px),
linear-gradient(135deg, transparent 136px, #555555 136px),
linear-gradient(315deg, transparent 136px, #555555 136px),
linear-gradient(45deg, transparent 136px, #555555 136px),
linear-gradient(225deg, transparent 136px, #000000 136px),
linear-gradient(45deg, transparent 136px, #000000 136px);
background-position:
70px -45px,
-45px -80px,
35px 70px,
-80px 35px,
35px -45px,
-45px 35px;
}