Fix alignment on first generation

static/canvas.js

@@ -68,6 +68,7 @@ let draw = function() {
   ctx.fillRect(0, height * 0.85 - 1, width, height * 0.15 + 1);
   ctx.fill();
   ctx.font = '12pt FiraSans';
+  ctx.textBaseline = 'top';
   ctx.fillStyle = '#497ed5';
   let offset = height * 0.05;
   if (signature) {
@@ -81,7 +82,7 @@ let draw = function() {
     offset += ctx.measureText(', s').width;
   } else {
     ctx.fillText('S', offset, height * 0.9);
-    offset+= ctx.measureText('S').width;
+    offset += ctx.measureText('S').width;
   }
   ctx.fillText(_('outenez '), offset, height * 0.9);
   offset += ctx.measureText(_('outenez ')).width;