.callout {
  border-left: 4px solid #0d6efd;
  background-color: #e7f1ff;
  padding: 1rem;
  margin: 1.5rem 0;
  border-radius: 0.25rem;
}
.callout-title {
  font-weight: bold;
  margin-bottom: 0.5rem;
}
.callout-body p:first-child {
  margin-top: 0;
}
.callout-info { border-color: #0d6efd; }
.callout-note { border-color: #6c757d; }
.callout-warning { border-color: #ffc107; }

/* add more .callout-type rules if you use other types */