Stacked Histogram

import matplotlib.pyplot as plt
import numpy as np

COLORS = {'cat1': '#6366F1', 'cat2': '#10B981', 'cat3': '#F59E0B', 'background': '#FFFFFF', 'text': '#1E293B', 'text_muted': '#64748B', 'grid': '#F1F5F9'}

np.random.seed(42)
cat1 = np.random.normal(50, 10, 300)
cat2 = np.random.normal(55, 12, 200)
cat3 = np.random.normal(45, 8, 150)

fig, ax = plt.subplots(figsize=(10, 6), dpi=100)
ax.set_facecolor(COLORS['background'])
fig.patch.set_facecolor(COLORS['background'])

ax.hist([cat1, cat2, cat3], bins=20, stacked=True, 
        color=[COLORS['cat1'], COLORS['cat2'], COLORS['cat3']], 
        edgecolor='white', linewidth=0.5, alpha=0.85,
        label=['Category A', 'Category B', 'Category C'])

ax.spines['top'].set_visible(False)
ax.spines['right'].set_visible(False)
ax.spines['left'].set_color(COLORS['grid'])
ax.spines['bottom'].set_color(COLORS['grid'])
ax.yaxis.grid(True, color=COLORS['grid'], linewidth=1, zorder=0)
ax.set_axisbelow(True)
ax.tick_params(axis='both', colors=COLORS['text_muted'], labelsize=9, length=0, pad=8)
ax.set_xlabel('Value', fontsize=10, color=COLORS['text'], labelpad=10)
ax.set_ylabel('Count', fontsize=10, color=COLORS['text'], labelpad=10)
ax.legend(loc='upper center', bbox_to_anchor=(0.5, -0.12), ncol=3, frameon=False, fontsize=9, labelcolor=COLORS['text_muted'])

plt.tight_layout()
plt.show()