Chartjs-Can't increase font size in google bar chart

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first, you’re using chart.js not google charts

for chart.js, the x-axis label font size options are as follows… 

        scales: {
            xAxes: [{
                ticks: {
                    fontSize: 40
                }
            }]
        }

see following working snippet… 

$(document).ready(function() {
    var ctx = document.getElementById("myChart").getContext('2d');
    var myChart = new Chart(ctx, {
        type: 'bar',
        data: {
            labels: ['Break','Lunch','Meeting','Aux Out','Aux In'],
            datasets: [{
                data: [20, 20, 20, 20, 20],
                backgroundColor: [
                    'rgba(66, 244, 98, 0.9)',
                    'rgba(101, 3, 96, 0.9)',
                    'rgba(198, 192, 194, 0.9)',
                    'rgba(43, 136, 234, 0.9)',
                    'rgba(232, 11, 55, 0.9)'

                ],
                borderColor: [
                    'rgba(57,214,86,1)',
                    'rgba(81, 2, 77, 1)',
                    'rgba(145, 140, 141, 1)',
                    'rgba(37, 118, 203, 1)',
                    'rgba(173, 8, 41, 1)'

                ],
                borderWidth: 2
            }]
        },
        options: {
            responsive: true,
            legend : {
                display: false,
            },
            scales: {
                xAxes: [{
                    ticks: {
                        fontSize: 18
                    }
                }]
            }
        }
    });
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.bundle.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<canvas id="myChart"></canvas>

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