Minor about page parallax style edit.

static/sass/about.sass
	-Offset the third parallax background-image, `#img-3`, from the
	top more.

static/sass/about.sass

@@ -31,7 +31,7 @@ div.bg
         background: url(../img/about/bg3.png) no-repeat
         background-size: cover
         height: $img-height + 300
-        top: 2650px
+        top: 2850px
 
     &#img-4
         background: url(../img/about/bg4.png) no-repeat