Limit the number of lines in a block using CSS

Add the following to the styles file

.your-blocks  {
    margin: 2rem 0 1rem 0;
    line-height: 2rem;
    max-height: 8rem;
    -webkit-box-orient: vertical;
    display: -webkit-box;
    overflow: hidden!important;
    text-overflow: ellipsis;
    -webkit-line-clamp: 2;
}