details {
  margin-bottom: 16px;
}
details:last-child {
  margin-bottom: 0;
}
details summary {
  outline: none;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  list-style: none;
  border: none;
  margin: 0;
  padding: 0;
  display: inline-block;
  background: #ededed;
  padding: 8px;
  font-size: 18px;
  font-weight: 500;
  text-transform: none;
}
details summary::-webkit-details-marker {
  display: none;
}
details[open] summary ~ * {
  -webkit-animation: spoiler 0.5s ease-in-out;
          animation: spoiler 0.5s ease-in-out;
}
details div {
  background: #EEF1F8;
  padding: 16px;
}
details div p {
  margin: 0;
  font-size: 17px;
  margin-bottom: 16px;
}
details div p:last-child {
  margin-bottom: 0;
}

@-webkit-keyframes spoiler {
  0% {
    opacity: 0;
    margin-top: -8px;
  }
  100% {
    opacity: 1;
    margin-top: 0;
  }
}

@keyframes spoiler {
  0% {
    opacity: 0;
    margin-top: -8px;
  }
  100% {
    opacity: 1;
    margin-top: 0;
  }
}