.js-desc-text{
  position: relative;
  white-space: normal;
}

/* colapsado por líneas */
.js-desc.is-collapsed .js-desc-text{
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* degradado */
.js-desc.is-collapsed .js-desc-text::after{
  content:"";
  position:absolute;
  left:0; right:0; bottom:0;
  height: 1.8em;
  pointer-events:none;
  background: linear-gradient(to bottom, rgba(255,255,255,0), rgba(255,255,255,1));
}

.js-desc.is-toggleable .js-desc-text{ cursor:pointer; }