Remove article page hero background color

[joshdarby]

Posts with no featured image are showing a gray box because of

.hero {
    text-align: center;
    background-color: #efefef;
    margin: 0 0 24px;
}

Let's remove that background color attribute.

Example:

[joshdarby]

On second thought, this seems like a Largo issue with featured media.

Steps to reproduce:

1. Add a featured media image
2. Remove featured media from the post by going Featured Image -> Remove featured image
3. View the frontend and note the gray box

[joshdarby]

So, in the meantime, any post CIJN is experiencing this issue with can be fixed by selecting Featured Media -> Hide on Single Post display which will hide the hero element from the article page

[joshdarby]

Largo issue: WPBuddy/largo#1845