Status bar animated with keyFrame

While coding this challenge, I found a video by Kevin Powell about aimating gradients – which fits perfectly to this challenge. It's applied at .load-used. I had issues to center the boxes in te desktop view. I applied flex-basis, so that both boxes are on one line. But the align-items: center does not work anymore. I solved this with adding a padding-top: 25% – but this does not feel good. :)