'Thick line intersection in colorbar

I plot the Colorbar but, I have thick line intersection between Colorbar and bounds. Do you have any idea for remove it or make it less thick?

bounds = [-0.9,-0.7,-0.5,-0.3,-0.1,0.1,0.3,0.5,0.7,0.9]
cbar = fig.colorbar(fig_SST, ax=axes, pad=0.04, ticks=bounds, location='bottom', shrink=0.5, orientation='horizontal')
cbar.ax.tick_params(labelsize=3)
cbar.set_label(label="[K/$\sigma$]", fontsize=3)

enter image description here



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