body {
    display: flex;
    justify-content: center;
    background: url(./dbo.jpg);
    margin: 0;
    /*overflow: hidden;*/
}
.mymove {
    opacity: 0.8;
    height:500px;
    line-height:500px;
    -webkit-transition: line-height 0.3s ease-in;
    -moz-transition: line-height 0.3s ease-in;
    -ms-transition: line-height 0.3s ease-in;
    -o-transition: line-height 0.3s ease-in;
    transition: line-height 0.3s ease-in;
    -webkit-animation: mymove 5s infinite;
    -o-animation: mymove 5s infinite;
    animation: mymove 5s infinite;
}
.mymove.hidden {
    height: 0;
    line-height: 50px;
    opacity: 1;
}
.mymove.hidden a, .mymove.hidden a:visited {
    color: aliceblue;
}
.mymove a, .mymove a:visited {
    color: black;
}
.mymove div a {
    font-size: 32px;
    display: inline-block;
    margin: 28px 0 0;
}
.mymove:not(.hidden) div a {
    background-color: gray;
    border-radius: 10px;
    padding: 3px 12px;
}
@keyframes mymove {
    0% {
        background-color: yellowgreen;
    }
    50% {
        background-color: orange;
    }
    100% {
        background-color: #999;
    }
}
@-webkit-keyframes mymove{
    0% {
        background-color: yellowgreen;
    }
    50% {
        background-color: orange;
    }
    100% {
        background-color: #999;
    }
}
@-o-keyframes mymove {
    0% {
        background-color: yellowgreen;
    }
    50% {
        background-color: orange;
    }
    100% {
        background-color: #999;
    }
}