footer {
    display: flex;
    height: 50px;
    overflow: hidden;
}

.line-item-footer {
    height: 50px;
    opacity: 0;
    transition: opacity 1s;
}

.line-item-footer.on {
    opacity: 1;
}

.line-item-footer.action {
    opacity: 1;
    transition: opacity 0s;
}

.line-item-footer img {
    height: 100%;
    width: auto;
}