Smooth Accordion

Collapsible accordion sections.

.acc details { border:1px solid #333; border-radius:8px; margin-bottom:4px; overflow:hidden; }
.acc summary { padding:12px 16px; cursor:pointer; font-weight:500; list-style:none; }
.acc summary::marker{display:none}
.acc details[open] summary { border-bottom:1px solid #333; }
.acc .acontent { padding:12px 16px; color:#999; font-size:14px; }