.header {
  background-color: #14284c;
  padding: 1em;
  margin: 1.5em 0;
  font-weight: bold;
  display: flex;
  justify-content: space-between;
}

label:after {
  content: "∨";
  right: 1em;
}

input:focus + label {
  border: 1px dotted white;
}

input {
  opacity: 0;
  overflow: hidden;
  position: absolute;
  z-index: -1;
}

input:checked + label:after {
  content: "∧";
}

.content {
  margin-bottom: 1.5em;
  padding: 0 2em;
  display: none;
}

input:checked ~ .content {
  display: block;
}