How change CSS of Script Report

I Build a report for my client but i have to add multiple lines in report columns i tried to do it via Report JS file but it didn’t worked

Here is my script

/* eslint-disable */

let date = new Date()
let from_date = new Date(date.getFullYear(), date.getMonth(), 1)
let to_date = new Date(date.getFullYear(), date.getMonth() + 1, 0)


frappe.query_reports["Cheque Clearance"] = {
	"filters": [
		{
			'label': 'Party Name',
			'fieldname': 'party_name',
			'fieldtype': 'Data',
			'width': 90
		},
		{
			'label': 'Cheque Number',
			'fieldname': 'cheque_number',
			'fieldtype': 'Data',
			'width': 90
		},
		{
			'label': 'From Date',
			'fieldname': 'from_date',
			"default": from_date,
			'fieldtype': 'Date',
			"reqd": 1,
			'width': 90
		},
		{
			'label': 'To Date',
			'fieldname': 'to_data',
			"default": to_date,
			'fieldtype': 'Date',
			"reqd": 1,
			'width': 90
		},
	],

	// "formatter":function (row, cell, value, columnDef, dataContext, default_formatter) {
	// 	value = default_formatter(row, cell, value, columnDef, dataContext);
	// 	if (dataContext.name > 0) {
	// 		var $value = $value + $(value).css("background-color", "#75ff3a");
	// 		value = $value.wrap("<p></p>").parent().html();
	// 	}
	// 	return value;
	// },

	onload: function (report) {


		const a1 = document.getElementsByClassName("dt-row dt-row-header")[0]
		// console.log(a1.find("dt-row dt-row-header"))
		console.log(a1)
		// document.getElementsByClassName("dt-row dt-row-header")[0].style.height="50px";


		// frappe.query_reports.datatable.style.setStyle(".dt-row-header",{height:"50px"})

		// const a1 = document.getElementsByClassName("dt-row dt-row-header")[0].css("height","50px")


	}

	// cell :dt-cell dt-cell--col-3 dt-cell--header dt-cell--header-3
	// container : class="dt-row dt-row-header"

};

// frappe.query_reports.datatable.style.setStyle(".dt-row-header",{height:"50px"})