message: Remove border and fix hover color for matrixdropdown detail button
diff: @@ -156,16 +156,17 @@ $label-disabled-color: rgba(64, 64, 64, 0.5);
  width: 32px;
  }
  .sv_matrix_cell_detail_button {
  - vertical-align: middle;
  - text-align: center;
  width: 29px;
  height: 29px;
  min-width: 0px;
  padding: 0;
  - background-color: $main-color;
  + outline: none;
  }
  .sv_matrix_cell_detail_button_expanded {
  background-color: lightgray;
  + &:hover {
  + background-color: darkgray;
  + }
  }
  .sv_matrix_cell_detail_rowtext {
  vertical-align: middle;
  