redash/client/app/components/dashboards/widget.less

.widget-wrapper {
  .body-container {
    display: flex;
    flex-direction: column;
    align-items: stretch;

    .body-row {
      flex: 0 1 auto;
    }

    .body-row-auto {
      flex: 1 1 auto;
    }
  }

  .spinner-container {
    position: relative;

    .spinner {
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      position: absolute;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
    }
  }

  .dropdown-header {
    padding: 0;

    .actions {
      position: static;
    }
  }

  .t-header.widget {
    .dropdown {
      margin-top: -5px;
      margin-right: -5px;

      .actions {
        position: static;
      }
    }
  }
}