nixos-configs/config/ags/scss/widgets/overview.scss

.overview {
  min-height: 1px;
  min-width: 1px;

  .workspace .window {
    border-radius: 10px;

  }

  .normal {
    margin-bottom: 5px;

    .workspace {
      margin: 0 10px;

      .window {
        border: 2px solid #411C6C;

        &.active {
          border: 2px solid purple;
        }
      }
    }
  }
  .special {

    .workspace {
      margin: 0 5px;

      .window {
        border: 2px solid lighten($color: black, $amount: 20);

        &.active {
          border: 2px solid purple;
        }

      }
    }
  }
}