web-apps/apps/presentationeditor/main/resources/less/transitions.less

#transitions-panel {
  .item {
    background: transparent;
    border-color: transparent;
    .box-shadow(none);
    border-radius: @scaled-one-px-value-ie;
    border-radius: @scaled-one-px-value;
    border-width: calc(2*@scaled-one-px-value-ie) ;
    border-width: calc(@scaled-two-px-value);
    &:hover{
      border-color: @border-preview-hover-ie;
      border-color: @border-preview-hover;
    }
    &.selected
    {
      border-color: @border-preview-select-ie;
      border-color: @border-preview-select;
    }

    .style{
      background: transparent;
    }

    .btn {
      border: none;
      &:hover {
        background-color: transparent;
      }
      .icon
      {
        margin-top: -2px;
      }

    }
  }
}