figure { margin: 2rem 0; }
figure img { display: block; width: 100%; height: auto; }
.equation img { width: auto; max-width: 100%; margin: auto; }
.equation img[src*="logistic-probability"] { width: 300px; }
.subtitle { color: #555; font-size: 1.1rem; }
.tldr {
  background: #eaf3ff;
  border: 1px solid #bfd8ff;
  color: #1e3a5f;
  border-radius: 14px;
  padding: 16px 18px;
  margin: 24px 0 32px;
  font-size: 1rem;
  line-height: 1.6;
}
.tldr ul { padding-left: 1.3rem; margin-bottom: 0; }
.tldr li { margin-bottom: 0.5rem; }
.tldr li:last-child { margin-bottom: 0; }
@media (max-width: 720px) {
  .tldr { padding: 14px 16px; }
}