var variable_name = $("#" + parser.m_formId).find (".aw-form-body");
variable_name.css ("background-color", "color_name _or_code");
eg.:
var thisForm = $("#" + parser.m_formId).find (".aw-form-body");
thisForm.css ("background-color", "black");
or,
var thisForm = $("#" + parser.m_formId).find (".aw-form-body");
thisForm.css ("background-color", "#abcdef");
thisForm.css ("color", "green") [.. change the color of text labels to green]
refer following for listing of properties which may be available to set:
http://www.w3schools.com/cssref/pr_border-style.asp