.ui-spinner-button.ui-spinner-up.ui-corner-tr.ui-button.ui-widget.ui-state-default.ui-button-text-only 
{
display:none!important;
}

.ui-spinner-button.ui-spinner-down.ui-corner-br.ui-button.ui-widget.ui-state-default.ui-button-text-only 
{
display:none!important;
}