Pyplot line color and spacing/padding

[metalray]

Dear Python Experts,

I have prepared a chart and just some visual upgrades in mind
I wonder why the chart goes beyond the maximum values given and
why there is a gap in the left corner.

fig1, ax1 = plt.subplots(figsize=(8, 4))
timeaxis = [2020, 2030, 2040, 2050, 2060]
s1 = [2578,2819,3060,3301,3542]
ax1.plot(timeaxis, s1, 'c-')
ax1.set_xlabel('Year')
# Make the y-axis label, ticks and tick labels match the line color.
ax1.set_ylabel('No. of pages in Federal Law Gazette', color='black')
ax1.tick_params('y', colors='black')
ax1.spines['top'].set_visible(False)
ax1.spines['right'].set_visible(False)
fig1.tight_layout()
plt.xticks(np.arange(min(timeaxis), max(timeaxis)+1, 10.0))

Finally, when I try to write "gray" or give a HEX code instead of 'g' for green an error is thrown.
How can I be more creative with the colors I use for the line chart?

Many thanks for any hints.