body {
	background-color: white;
	color: black;
	font-size: 20px;
	font-family: sans-serif;
}
h1 { 
   text-align: center;
   font-size: 50px;
   background-color: white;
   animation-name: myAnimation;
   animation-duration: 8s;
   
}
.style1 {
	text-decoration-line: underline; 
	font-weight: bold
	
}
.style2 {
	 text-decoration-line: underline;
	 font-style: italic
}
.style3 {
	font-style: normal
}
<div>
.style4 { 
   width: 100px;
   height: 100px;
   background-color: white;  
}
@keyframes myAnimation {
	form {color: black ;}
	to {color: black;}
}