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Colorbar size change

Hello,
I created the following heatmap:

However, I wanted to know if it is possible to change the colorbar size and make it go from the top to the bottom of the graph

Here is my code:
o <- plot_ly(x = Nice_dates,
y= depths,
z = DIN_DATA_2,
type = “heatmap”,
colorbar=list(
title=“Colorbar”
),
colorscale=“Jet”,
reversescale =T

) %>%
layout(
title = “DIN nutrients over Datetime related to depths”,
xaxis = list(title = “Time and Date”),
yaxis = list(title = “Depths[m]”))
o

Thank you very much