h1 {background:	;text-align:center;}
h1 {text-shadow:2px 2px #FF0000;}
h2 {background-color:	#00BFFF;color:white;text-align:center;}
h3 {background-color:	#004B97;color:white;text-align:center;}
body {background:url(https://www.cnblogs.com/kenken2018/gallery/image/225130.html) fixed;
    background-position:center;
    background-size:cover;

}
body{background:SlateGray ;}