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

.overview {

  .workspace {
    padding: 4px 15px 4px 0px;
    border: 2px solid transparent;
    border-radius: 10px;

    &.active {
      background-color: rgba(lighten($color: black, $amount: 15), 0.8);
      border: 2px solid black;
    }
  }

  .workspace .window {
    background-color: $bgfull;
    border-radius: 10px;
    margin: 0 10px;
    transition: min-width 0.2s ease-in-out,
                min-height 0.2s ease-in-out,
                border-color 0.2s ease-in-out,
                font-size 0.2s ease-in-out;
  }

  .normal {
    margin-bottom: 5px;

    .workspace {

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

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

    .workspace {

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

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

      }
    }
  }
}