Short code column width

I am trying to set a fixed column width for my tables to have an standard layout, however I only managed to set a maximum width. Is there any short code to set a fixed column width? or I must use CSS?

For instance a 3 column table where col1 is 60%, col2 is 20% and col3 20%

I am using the class=”igsv-table no-datatables” attribute

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https://ww.wp.xz.cn/plugins/inline-google-spreadsheet-viewer/