Sometimes background image does not display, here are some possible reasons:

1. “background-image” property is buggy, use “background”
2. Double quote for image path
3. “background-attachment: fixed” could cause unknown problem.

.column{
	background-position: center center;
	background-size: cover !important;
	background-repeat: no-repeat;
}
	.column.about{
		background: url("../images/index/iphone_index_1.jpg");
	}