Error Code Heatmap

import matplotlib.pyplot as plt
import numpy as np
from matplotlib.colors import LinearSegmentedColormap
from matplotlib.patches import FancyBboxPatch

fig, ax = plt.subplots(figsize=(12, 8), facecolor='#ffffff')
ax.set_facecolor('#ffffff')

np.random.seed(42)
error_codes = ['400', '401', '403', '404', '500', '502', '503']
services = ['API', 'Auth', 'CDN', 'DB', 'Cache']
errors = np.random.poisson(5, (len(services), len(error_codes)))

colors = ['#1e293b', '#7f1d1d', '#dc2626', '#f87171', '#fecaca']
cmap = LinearSegmentedColormap.from_list('error', colors, N=256)

cell_w, cell_h = 0.88, 0.82
for i in range(len(services)):
    for j in range(len(error_codes)):
        val = errors[i, j]
        rect = FancyBboxPatch((j - cell_w/2, i - cell_h/2), cell_w, cell_h,
                               boxstyle="round,pad=0.02,rounding_size=0.12",
                               facecolor=cmap(val/errors.max()), edgecolor='#e2e8f0', linewidth=1.5)
        ax.add_patch(rect)
        if val > 0:
            ax.text(j, i, str(val), ha='center', va='center', color='#1e293b', fontsize=10, fontweight='bold')

ax.set_xlim(-0.5, len(error_codes)-0.5)
ax.set_ylim(-0.5, len(services)-0.5)
ax.set_aspect('equal')
ax.invert_yaxis()
ax.set_xticks(range(len(error_codes)))
ax.set_yticks(range(len(services)))
ax.set_xticklabels(error_codes, color='#64748b', fontsize=10, fontweight='500', family='monospace')
ax.set_yticklabels(services, color='#1e293b', fontsize=10, fontweight='500')

sm = plt.cm.ScalarMappable(cmap=cmap, norm=plt.Normalize(0, errors.max()))
cbar = plt.colorbar(sm, ax=ax, shrink=0.8, pad=0.02)
cbar.set_label('Error Count', color='#1e293b', fontsize=11)
cbar.outline.set_edgecolor('#e2e8f0')
plt.setp(plt.getp(cbar.ax.axes, 'yticklabels'), color='#64748b')

for spine in ax.spines.values(): spine.set_visible(False)
ax.tick_params(length=0)
ax.set_title('HTTP Error Distribution by Service', fontsize=18, color='#1e293b', fontweight='bold', pad=20)
plt.tight_layout()
plt.show()