Remove background images redundancy

[missmatsuko]

You don't need to have no-repeat when the background-size is set to cover:

cover
A keyword that is the inverse of contain. Scales the image as large as possible and maintains image aspect ratio (image doesn't get squished). The image "covers" the entire width or height of the container. When the image and container have different dimensions, the image is clipped either left/right or top/bottom.

https://developer.mozilla.org/en/docs/Web/CSS/background-size?v=control

Also changed "50%" to "center center" for understandability.

[missmatsuko]

This is still in the updated files:

background: url(../images/background-6.jpg) no-repeat;
background-size: cover;

no-repeat can be excluded because background-size is set to cover, so it wouldn't repeat anyways:

background-image: url(../images/background-6.jpg);
background-size: cover;