body {
animation: formFade 2s ease-in-out;
-moz-animation: formFade 2s ease-in-out; / Firefox /
-webkit-animation: formFade 2s ease-in-out; / Safari and Chrome /
-o-animation: formFade 2s ease-in-out; / Opera /
}

@keyframes formFade {
from {
    opacity:0;
}
to {
    opacity:1;
}
}
@-moz-keyframes formFade { / Firefox /
from {
    opacity:0;
}
to {
    opacity:1;
}
}
@-webkit-keyframes formFade { / Safari and Chrome /
from {
    opacity:0;
}
to {
    opacity:1;
}
}
@-o-keyframes formFade { / Opera /
from {
    opacity:0;
}
to {
    opacity: 1;
}
}