Site: For tables that display results, center the content horizontally
Site: For tables that display results, center the content horizontally

Close apache/calcite#2632

looker-open-source/calcite,looker-open-source/calcite,apache/calcite,julianhyde/calcite,julianhyde/calcite,apache/calcite,apache/calcite,julianhyde/calcite,looker-open-source/calcite,julianhyde/calcite,apache/calcite,apache/calcite,julianhyde/calcite,julianhyde/calcite,apache/calcite,looker-open-source/calcite,looker-open-source/calcite,looker-open-source/calcite