body{/*タイル背景*/
background-color:skyblue;/*背景色*/
background-size:50px 50px;/*タイルの大きさ*/
background-image:
linear-gradient(#fff 5%,transparent 5%,transparent 50%,#fff 50%,#fff 55%,transparent 55%),
linear-gradient(90deg,#fff 5%,rgba(255,221,255,.3) 5%,rgba(255,221,255,.3) 50%,#fff 50%,#fff 55%,transparent 55%),
linear-gradient(rgba(255,255,187,.3) 50%,transparent 50%);
}