vault/ui/app/styles/core/notification.scss

.notification {
  padding: 1rem 2.5rem 1rem 1.5rem;
  .title {
    font-weight: $weight-bold;
  }
  &.has-border {
    border: 1px solid currentColor;
    border-left-width: 10px;
  }

  @each $name, $pair in $colors {
    $color: nth($pair, 1);
    $color-invert: nth($pair, 2);
    $color-lightning: max((100% - lightness($color)) - 2%, 0%);
    $color-luminance: colorLuminance($color);
    $darken-percentage: $color-luminance * 70%;
    $desaturate-percentage: $color-luminance * 30%;
    &.is-#{$name} {
      background-color: lighten($color, $color-lightning);
      border-color: $color;
      color: desaturate(
        darken($color, $darken-percentage),
        $desaturate-percentage
      );
      .delete {
        color: $color;
      }
      .title {
        color: $color-invert;
        margin-bottom: .5rem;
      }
    }
  }

  &.is-warning {
    .title,
    .delete {
      color: $dark-yellow;
    }
    border-color: $orange;
    color: $dark-yellow;
  }

  & > .delete {
    &:before,
    &:after {
      content: none;
    }
    position: absolute;
    background-color: transparent;
    border: none;
    color: currentColor;
    right: 0.5rem;
    top: 0.5rem;
    height: 1.5rem;
    width: 1.5rem;
  }
}