* {
  box-sizing: border-box;
}

content-accordion {
  display: block;
}
content-accordion > button {
  display: block;
  width: 100%;
  padding: 0;
  border: none;
  font: inherit;
  color: inherit;
  background-color: transparent;
  cursor: pointer;
}
content-accordion[expanded] > .content-accordion__reveal {
  display: block;
}
content-accordion > .content-accordion__reveal {
  display: none;
}