create a animation name in css
p /*this is the css name of the element you will apply the animation to*/ {
animation-duration: 3s;
animation-name: slidein; /*animation name ofcourse*/
}
@keyframes slidein /*the animation name goes here*/ {
from {
margin-left: 100%;
width: 300%;
}
to {
margin-left: 0%;
width: 100%;
}
}