hugo-theme-next/assets/css/_common/components/post/post-alert.scss

@mixin alert-styles($type, $color) {
  .post-alert-#{$type} {
    padding: 0 0 0 10px;
    border-left: 6px solid $color;
    font-size: 0.825em;
    color: $color;
  }
}

@each $key, $color in $post_alert_colors {
  @include alert-styles(#{$key}, $color);
}

.post-alert-title, .post-expired-title {

  display: flex;
  align-items: center;
  line-height: 1.5;
  margin: 0;

  i {
    font-size: 1.25em;
    text-align: center;
    vertical-align: middle;
  }

  span {
    margin: 0 0 0 8px;
    letter-spacing: 0.08em;
  }
}

.post-alert-content, .post-expired-content {
  color: var(--text-color);
}