.group-index .box_group
{
    animation-name: out_index_box;
    animation-duration: 0.2s;
    animation-timing-function: ease-in-out;
    animation-fill-mode: backwards;
}

.group-index .box_group:hover
{
    animation-name: hover_index_box;
    animation-duration: 0.2s;
    animation-timing-function: ease-in-out;
    animation-fill-mode: forwards;
}