.read-more-state {
    display: none;
}

.read-more-target {
    opacity: 0;
    max-height: 0;
    font-size: 0;
    transition: .25s ease;
}

.read-more-state:checked~.read-more-wrap .read-more-target {
    opacity: 1;
    font-size: inherit;
    max-height: 999em;
}

.read-more-state~.read-more-trigger:before {
    content: 'See full session description';
}

.read-more-state:checked~.read-more-trigger:before {
    content: 'Close description';
}

.read-more-trigger {
    cursor: pointer;
    display: inline-block;
    padding: 0 .5em;
    color: #666;
    font-size: .9em;
    line-height: 2;
    border: 1px solid #ddd;
    border-radius: .25em;
}