Browsers like to smooth your precious pixels. We reject this.
.pixel-art {
image-rendering: pixelated;
width: 128px;
height: 128px;
border: 2px outset #66aaff;
background:#002244;
}
Bonus: CRT Frame
Combine a subtle inner shadow and scanlines layer for pseudo-monitor depth.
Tip: Avoid scaling GIFs by non-integer ratios if you want perfect edges.