body {
  margin-bottom: 85px;
}

.spoiler > input {
  display: none;
}

.spoiler-content {
  display:none;
}

.spoiler > input + label::after {
  content:"▼";
}

.spoiler > input:checked + label + .spoiler-content {
  display:block;
}

.spoiler > input:checked + label::after {
  content:"▲";
}

.dropdown:hover .dropdown-menu {
  display: block;
}

.dropdown button:focus + .dropdown-menu {
  display: block;
}

.alert {
  position: relative;
  padding: 0.75rem 1.25rem;
  margin-bottom: 1rem;
  border: 1px solid transparent;
  border-radius: 0.25rem;
}

.alert-success {
  color: #155724;
  background-color: #d4edda;
  border-color: #c3e6cb;
}

.alert-primary {
  color: #004085;
  background-color: #cce5ff;
  border-color: #b8daff;
}

.alert-warning {
  color: #856404;
  background-color: #fff3cd;
  border-color: #ffeeba;
}

.toc {
  padding-left: 20px;
  list-style-type: none;
}
.toc a {
  text-decoration: none;
  color: #000000;
}

.text-shadow {
  text-shadow: 2px 2px 3px #000000;
}