fix: preloader does not fade out as intended

[Joey Padasian]

Noticed in the most recent version of Chrome at least that the preloader no longer fades out on top of the creative.

Instead items instantly appear on the screen in place.

[Joey Padasian]

I feel like preloader.scss should include:

.preloader {
  position: absolute;
  background: #fff;
  height: 100%;
  width: 100%;
  z-index: 999;
}