Instead of a card, make your valentine a website(valentine.brace.io)

  function drawHeart(ctx, x, y) {
        x += 100;
        y += 100;

        ctx.beginPath();
        ctx.moveTo(x, y);
        ctx.quadraticCurveTo(x + 30,  y + 60, x + 80,  y + 100);
        ctx.quadraticCurveTo(x + 130, y + 60, x + 160, y);
        ctx.bezierCurveTo   (x + 200, y - 75, x + 100, y - 90, x + 80, y - 20);
        ctx.bezierCurveTo   (x + 60,  y - 90, x - 40,  y - 75, x, y);
        ctx.fill();
        ctx.closePath();
      }