src/theme/Admonition/Layout/styles.module.css

.admonition {
  margin-bottom: 1em;
}

.admonitionHeading {
  font: var(--ifm-heading-font-weight) var(--ifm-h5-font-size) / var(--ifm-heading-line-height) var(--ifm-heading-font-family);
  text-transform: uppercase;
  font-size: 1rem;
  color: #00000A;
  margin-bottom: 0.75rem !important;
  font-weight: 600;
}

/* Heading alone without content (does not handle fragment content) */
.admonitionHeading:not(:last-child) {
  margin-bottom: 0.3rem;
}

.admonitionHeading code {
  text-transform: none;
}

.admonitionIcon {
  display: inline-block;
  vertical-align: middle;
  margin-right: 0.4em;
}

.admonitionIcon svg {
  display: inline-block;
  height: 1.6em;
  width: 1.6em;
  fill: var(--ifm-alert-foreground-color);
}

.admonitionContent :last-child {
  margin-bottom: 0 !important;
}