html{
    opacity:0;
    transition:all 2.0s;
}

an-1 {
    animation: 2s ease-in-out 0s infinite alternate op;
}

an-2 {
    animation: 2s ease-in-out 0s infinite alternate mv;
    display: inline-block;
    position: absolute;
    color:red;

}

@keyframes op {
    0% {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}

@keyframes mv {
    0% {
        left: 0;
        opacity: 1;
    }

    100% {
        left: 0;
        opacity: 0;
    }
}