.preview-pane {
  position: relative;
  padding: 20px 20px 120px 20px;
  display: flex;
  align-items: stretch;
  justify-content: space-around;
  flex-direction: column;

  .objects {
    display: flex;
    align-items: center;
    justify-content: space-around;

    .check,
    .assignment {
      padding: 10px;
      border: 2px solid rgba(190,0,0,1);
      background: white;
      border-radius: 10px;
      text-align: center;
      &.valid {
        border-color: rgba(0,150,0,1);
      }
    }
  }

  .combinator {
    text-align: center;
  }

  .computer {
    text-align: center;
  }
}

.preview-pane {
  position: relative;
  padding: 20px 20px 120px 20px;
  display: flex;
  align-items: stretch;
  justify-content: space-around;
  flex-direction: column;

  .objects {
    display: flex;
    align-items: center;
    justify-content: space-around;

    .object {
      margin: auto;
    }

    .check,
    .assignment {
      padding: 10px;
      border: 2px solid rgba(190,0,0,1);
      background: white;
      border-radius: 10px;
      text-align: center;
      &.valid {
        border-color: rgba(0,150,0,1);
      }
    }
  }

  .combinator {
    text-align: center;
  }

  .computer {
    text-align: center;
  }
}

Fix alignment of objects in preview pane.
Fix alignment of objects in preview pane.
