.collapsible .collapsible-content {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: opacity 0.5s linear, max-height 0.5s linear, margin-top 0.5s linear 0.1s;
}

.collapsible .collapsible-content.is-shown {
    max-height: 4em;
    margin-top: 10px;
    opacity: 1;
    transition: opacity 0.5s linear, max-height 0.5s linear, margin-top 0.5s linear;
}