add a black line datarange google script code example

Example 1: getranges google script

let SS = APP.getActiveSpreadsheet();
let sheetIndex0 = SS.getSheets()[0];

sheetIndex0.getRangeList(['A1', 'B1:C7']).setHorizontalAlignment("center");

Example 2: .setRowHeights google script

var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheets()[0];

// Sets the first three rows to a height of 20 pixels
sheet.setRowHeights(1, 3, 20);