details {
    width: 100%;
    margin: 0 auto;    
  /*  margin-bottom: .5rem; */
  /*  box-shadow: 0 .1rem 1rem -.5rem rgba(25,31,52,.4); */
    border-radius: 2px;
    overflow: hidden;
    margin-top: 16px !important;
    padding: 0px !important;
}

summary {
    padding: 1rem;
    display: block;    
    padding-left: 2.2rem;
    position: relative;
    cursor: pointer;
    user-select: none;
}

    summary:before {
        content: '';
        border-width: .4rem;
        border-style: solid;
        border-color: transparent transparent transparent #000;
        position: absolute;
        top: 1.3rem;
        left: 1rem;
        transform: rotate(0);
        transform-origin: .2rem 50%;
        transition: .25s transform ease;
    }

/* THE MAGIC 🧙‍♀️ */
details[open] > summary:before {
    transform: rotate(90deg);
}


details summary::-webkit-details-marker {
    display: none;
}

details > ul {
    padding-bottom: 1rem;
    margin-bottom: 0;
}