/*Первый уровень*/
span{background:linear-gradient(180deg,#00008B,#00ff00)}
/*Второй уровень*/
a[href^="https://"]{background:red}
li+li+li:last-child{background:blue}
ul+p{font-size: 26px}
/*Третий уровень*/
span+div+h3{background: pink}
#greycol{background: grey}
div+div{background: red}
div+div+h3+p{background: green}
.yellow{background: yellow}
/*Четвёртый уровеень*/
body{width: 100%; height: 100%;position: absolute;top:0;left:0;overflow: auto;}
.bg-box{
		width: 100%;
		height: 100%;
		background:
		url(https://img2.goodfon.ru/wallpaper/big/0/5b/pole-zelen-trava-dom-derevya.jpg) 50% 50% no-repeat ,
		url(https://www.freeiconspng.com/uploads/lamp-png-0.png) 0% 0% repeat-x,
		url(https://www.freeiconspng.com/uploads/grass-png-images-pictures-transparent-28.png) 100% 100% repeat-x ,
		url(https://avatanplus.com/files/resources/mid/58eb07b830eab15b56162788.png) 100% 100%  repeat-y ,
		url(https://vignette.wikia.nocookie.net/mashaandthebear/images/e/e0/Ёжик.png/revision/latest?cb=20180209130328&path-prefix=ru) 0% 0% repeat-y ,
		green 50% 50% no-repeat;
		background-size: 50% 50% , 5% 15%  , 25% 20% , 4% 4% , 4% 6% , 100% 100%;
		}