Was looking for the same thing. Found a workaround... Changing the bar label's font size can be used to change the height of the bar itself. It's crude, but it works!
timeline: {
barLabelStyle: {
fontSize: 50
}
}
Credit goes to https://groups.google.com/forum/m/#!topic/google-visualization-api/IKm5IlMx9es
You can zoom your chart by setting greater value of width
var options = {
width : 2000,
...
};
About CSS (comments). After chart.draw() there is SVG object contains chart. You can select elements like svg > g:nth-child(5) > rect
and change properties.
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