Piano black background image

Is there an option through the dashboard in Appearance > Themes – Customise ?

I can’t findt that, there’s only logo file and not background image. But I ‘d like to change especially the left and right side of the theme.

For e.g.https://i1125.photobucket.com/albums/l595/Atomantiii/piano.jpg

Is there a section of the dashboard named, ‘Custom Styles’ or ‘Custom CSS’, or something similar?

There’s a style.css. Perhaps it contains this background information?

….
/* —— layout ———————— */

#wrapper { background:url(img/back2.png) no-repeat center top; }
#contents { width:959px; margin:0 auto; text-align:left; }
#header { background:url(img/top.png) no-repeat bottom; height:160px; }
#middle-contents { background:url(img/side.png) repeat-y; padding-bottom:50px; }
#left-col { float:left; display:inline; width:584px; margin:0 0 0 5px; }
#right-col { float:right; display:inline; width:330px; margin:70px 5px 0 0; }
#footer { background:url(img/bottom.png) no-repeat top; height:114px; margin-bottom:50px; }
….

You ought to refrain from modifying a theme’s original files, as any changes made will erase once the theme updates.

Your easiest option is to use a Custom Style/CSS plugin, whereby you activate the plugin and enter CSS in the area allocated.

Another option, less easy, is to use a Child Theme, which contains another style.css file for CSS, but you can make greater modifications to everything else as well.

Thanks, I’ll try this plugin.

I know the correct answer:

I’ve modified this in style.css:

body { margin:0; padding:0; background:url(img/back1.gif);

Modified version:
body { margin:0; padding:0; background:url(your background file.jpg);
background-repeat:repeat;
background-attachment:fixed; }