Q:

Changing ion-content's background color

How can I change the background color of an ion-content in ionic 2?

A:

In your app.scss add :
.bg-style {
    background: red;
}

and apply style to content as in your component Html file :
<ion-content class="bg-style">

A:

Go to theme/variebles.css and add 
$background-ios-color: #0F0029;
$background-md-color: #0F0029;

For ios and android backgrounds

