A little help needed - weebly users/web designers

[matt blue]

Am looking to change the layout of my weebly site, have had a look through most of the designs but none take my fancy.

Where my site has grey going down the sides id really like to have that in blue.

Is it easy to edit the site in say html to enable me to have this ?

Thanks

Matt
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http://cardiffcityprogrammes.weebly.com/

Take a look at my work in progress !!