your service has bug

I used a translator and it might be awkward.
Hello, I used your service and said there was no problem with a css document that didn't work properly.
The content of the document is
img:hover{
animation-name: rt;
transition: all ease 1s;
animation-iteration-count: infinite;
transition-duration: 6s;
}
@keyframes rt {
0% {
transform: rotate(0deg);
}
20% {
transform: rotate(60deg);
}
40% {
transform: rotate(120deg);
}
60% {
transform: rotate(180deg);
}
80% {
transform: rotate(240deg);
}
100% {
transform: rotate(300deg);
}
}
I don't know why this is not work yet.