body{/*檜垣の背景*/
background-color:#ecb;
background-size:40px 20px;
background-position:10px 10px,0 0;
background-image:
linear-gradient(-45deg,transparent 15%,#fff 15%,#fff 19%,transparent 19%,transparent 48%,#fff 48%,#fff 52%,transparent 52%),
linear-gradient(45deg,transparent 15%,#fff 15%,#fff 19%,transparent 19%,transparent 48%,#fff 48%,#fff 52%,transparent 52%);
}