section {
    background-image: url('../img/elissys_main.jpg');
}

section article {
    position: relative;
    top: calc(50% - 100px);
    left: calc(100% - 790px);
    width: 700px;
    padding-right: 120px;
    transition: all .3s ease-in-out
}

section article.animated {
    left: calc(100% - 850px);
}