doc/dev/plugins/problems/scss/_preset.scss

.report-output {

  #admin-main .admin-block & {

    .toast {
      .btn {

        color: $white;
        border: 1px solid darken($flat-nephritis, 5%);
        background-color: darken($flat-nephritis, 3%);

        &:hover {
          border-color: darken($flat-nephritis, 7%);
          background-color: darken($flat-nephritis, 5%);
        }

        &.btn-error {
          border: 1px solid darken($flat-pomegranate, 5%);
          background-color: darken($flat-pomegranate, 3%);

          &:hover {
            border-color: darken($flat-pomegranate, 7%);
            background-color: darken($flat-pomegranate, 5%);
          }
        }

        &.btn-warning {
          border: 1px solid darken($flat-carrot, 5%);
          background-color: darken($flat-carrot, 3%);

          &:hover {
            border-color: darken($flat-carrot, 7%);
            background-color: darken($flat-carrot, 5%);
          }
        }
      }
    }
  }

  ul.problems {
    background-color: $content-bg;
    color: $content-text;

    .toast {
      color: $white;

      &.toast-success {
        background-color: $flat-nephritis;
      }

      &.toast-error {
        background-color: $flat-pomegranate;
      }

      &.toast-warning {
        background-color: $flat-carrot;
      }
    }

    ul.details {
      background-color: $content-bg;

      code {
        color: $content-link;
        @if (lightness($content-bg) < 50) {
          background: rgba(#f0f7fe, 0.1);
        } @else {
          background: rgba(#f0f7fe, 0.8);
        }

      }

      .menu-item {
        border-top: 1px solid $underline;
      }

      .menu-badge {
        .label {
          &.label-success {
            background: $flat-nephritis;
          }

          &.label-error {
            background: $flat-pomegranate;
          }
        }
      }
    }
  }
}