Add image as background

[mauromanassi]

I am trying to add an image in the background. Ideally, I would like it to cover the entire webpage, header included.
Does anybody know how to do that?

[jroeder-astro]

I second this; for a non-html and non-css programmer like me it seems very difficult to add a background image

[vydlt]

I am trying to add an image in the background. Ideally, I would like it to cover the entire webpage, header included. Does anybody know how to do that?

The following method works for me:

• Go to /_sass/_reset.scss/
• Delete line L10 and add a few other lines:
  L10: background-image: url(https://your-url);
  L11: background-size: 100%;
  L12: background-repeat: no-repeat;
  L13: background-attachment: fixed;
  L14: background-position: center;