.container {
  box-shadow: 0.2em 1em 2em -1em #d6d1e0;
  margin: 2.4em 0;
}

.collapse-init summary + * {
  transition: all 0.25s ease-in-out;
  overflow: hidden;
}

/*
  Closed state. Any CSS transitions work here
  The JS has a height calculation to make sliding opened/closed easier, but it's not necessary
  Remove the height prop for a simple toggle on/off (after all that work I did for you?)
*/
.collapse-init :not(.panel-active) summary + * {
  height: 0;
  opacity: 0;
  -webkit-transform: scale(0.9);
          transform: scale(0.9);
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}

.collapse-init summary {
  list-style: none;
}
.collapse-init summary::-webkit-details-marker {
  display: none;
}
.collapse-init summary::before {
  display: none;
}
.collapse-init summary {
  cursor: pointer;
}

.collapse-init summary::after {
  border-right: 2px solid;
  border-bottom: 2px solid;
  content: '';
  float: right;
  width: 0.5em;
  height: 0.5em;
  margin-top: 0.25em;
  -webkit-transform: rotate(45deg);
          transform: rotate(45deg);
  transition: inherit;
}


.details-styling {
  padding: 1em;
}

details {
  background: #fff;
  border: 1px solid #d6d1e0;
  border-bottom: 0;
  list-style: none;
}
details:first-child {
  border-radius: 6px 6px 0 0;
}
details:last-child {
  border-bottom: 1px solid #d6d1e0;
  border-radius: 0 0 6px 6px;
}




summary {
  display: block;
  transition: 0.2s;
  font-weight: 700;
  padding: 1em;
}
summary:focus {
  outline: 2px solid #5b13ec;
}
.collapse-init summary::after {
  border-right: 2px solid;
  border-bottom: 2px solid;
  content: '';
  float: right;
  width: 0.5em;
  height: 0.5em;
  margin-top: 0.25em;
  -webkit-transform: rotate(45deg);
          transform: rotate(45deg);
  transition: inherit;
}
[open] summary {
  background: #015198;
  color: #f8f5fe;
}
[open] summary::after {
  margin-top: 0.5em;
  -webkit-transform: rotate(225deg);
          transform: rotate(225deg);
}


.container {
  box-shadow: 0.2em 1em 2em -1em #d6d1e0;
  margin: 2.4em 0;
}