.toproller{
    position: relative;
    max-height: 0;
    overflow-y: hidden;
    transition-property: all;
    transition-duration: .5s;
    transition-timing-function: cubic-bezier(0, 1, 0.5, 1);
}
.toproller.opened{
    max-height: initial;
    padding: 20px 20px 30px;
}
i.toproller-close-button {
    position:  absolute;
    right: 10px;
    top: 10px;
    width: initial;
}