Hi @thanda-marketing Jenna,
To remove the background color for all the sections go to Appearance > Customize/Theme Options > Design Options Tab > Custom CSS paste the following CSS code and Click on save button:
.wrapper,
.info-bar,
.widget_ourclients,
#colophon .widget-wrap,
#colophon .info-bar
#site-generator {
background-color: transparent;
}
Also please remove the CSS code that you have added. You have added a wrong code which shown an invalid code.
Thank you for using our theme.