You need to use vendor specific prefixes in @keyframes
too. It works in Codepen because it checks what browser you use and adds the prefix automagically. If you inspected the codepen output you'd notice.
@-webkit-keyframes move {
0% { top: 0px; }
20% { top: -50px; }
40% { top: -100px; }
60% { top: -150px; }
80% { top: -200px; }
}
@-moz-keyframes move {
0% { top: 0px; }
20% { top: -50px; }
40% { top: -100px; }
60% { top: -150px; }
80% { top: -200px; }
}
@-o-keyframes move {
0% { top: 0px; }
20% { top: -50px; }
40% { top: -100px; }
60% { top: -150px; }
80% { top: -200px; }
}
@keyframes move {
0% { top: 0px; }
20% { top: -50px; }
40% { top: -100px; }
60% { top: -150px; }
80% { top: -200px; }
}