.p1{
    width:15vw;
    height:12vw;
    background: content-box radial-gradient(crimson, skyblue);
    border: double 5px #000;
}
.p2{
    width:15vw;
    height:12vw;
    background: content-box
     linear-gradient(yellow, skyblue);
}
.p3{
    width:15vw;
    height:12vw;
    background: content-box
     linear-gradient(to left,yellow, skyblue);
}
.p4{
    width:15vw;
    height:12vw;
	background-color: #80ffff;
	background-image:
	 linear-gradient(0deg, #fff 50%, transparent 50%);
	background-size: 5px 5px;
}
.p5{
    width:15vw;
    height:12vw;
    background-color: #ff8040;
    background-image:
     repeating-linear-gradient(45deg,#fff, #fff 2px,transparent 0, transparent 3px);
}
th:nth-of-type(1){background-color:violet}
tr:nth-of-type(6) > td:nth-of-type(3) {background-color:violet}