The "options" parameter included below demonstrates many style changes you can make to a bar chart.
viz.chart({
sql: "SELECT Major, StartingMedianSalary, MidCareerMedianSalary FROM Degrees",
chartType: "BarChart",
containerId: "chart1",
options: {
title: "Salaries by Degree",
titleTextStyle: {
color: "#777777",
fontName: "Arial",
fontSize: 18
},
legend: {
position: "right"
},
colors: ["#bb0000", "#ffaa00"],
hAxis: {
title: "Annual Salary",
format: "currency"
}
}
});