.primary-btn background: #2b4b9e; border-bottom-color: #6ea4ff; box-shadow: 0 4px 12px #1e3a8a55;

While many commercial .io games (Agar.io, Slither.io) use custom servers, many smaller multiplayer experiments and clones are hosted on github.io .

// draw grid (github vibe) ctx.strokeStyle = "#2a3650"; ctx.lineWidth = 0.5; for(let i=0; i<width; i+=40) ctx.beginPath(); ctx.moveTo(i,0); ctx.lineTo(i,height); ctx.stroke(); ctx.beginPath(); ctx.moveTo(0,i%height); ctx.lineTo(width,i%height); ctx.stroke();

/* header with github flair */ .feature-header display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; padding: 1.5rem 2rem; background: #0b1120cc; border-bottom: 1px solid #1e2a44;

.canvas-panel flex: 2; min-width: 280px; background: #070c17; border-radius: 1.5rem; padding: 1rem; box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);