body{/*レンガの背景*/
background-size:40px 40px;
background-position:1px 36px,35px 20px,21px 16px,15px 0,0 0,0 0;
background-image:
linear-gradient(-45deg,#951 15%,transparent 0),
linear-gradient(135deg,#951 15%,transparent 0),
linear-gradient(-45deg,#951 15%,transparent 0),
linear-gradient(135deg,#951 15%,transparent 0),
linear-gradient(90deg,transparent 16px,#730 16px,#730 20px,transparent 20px,transparent 36px,#730 36px),
linear-gradient(180deg,#951 16px,#730 16px,#730 20px,#951 20px,#951 36px,#730 36px);
}