d4z_c0nf on "[Theme: Customizr] Issue with footer bottom (div#push)"

The grey background footer is by default in customizr.
About the withe line:
That's why I told you to change also the wrap div margin bottom to -62, it depends to the footer height, if you change it, you have to change also that. I will probably make a javascript version for that snippet.
So, you have this:

#wrap {
min-height: 100%;
height: auto !important;
height: 100%;
margin: 0 auto -72px;
}

and you have to make it like this:

#wrap {
min-height: 100%;
height: auto !important;
height: 100%;
margin: 0 auto -62px;
}

Anyway in the snippet is stated that you had to change footer and push height values to suit your needs, and that the wrap depends on the footer height+border.

Hope this helps.