Background color help

#1

Good day
I just finished a new design and have a small problem. I want the background-color: 000; grows with the content and that without a fixed height.
I remove min-height: 500px; the background disappears completely.
CODE
1.body {
2.background-color: #151515;
3.font-family: averia_sans_librelight;
3.color: #fff;