Please provide a link to a page on your site where we can see this. Thanks.

My site is the following. There have been no updates for the theme itself. Running Magazine 1.5.6 which is from Themify.

https://www.handsonkyoto.com

#header {
    background-color: initial;
}

This CSS will make it all orange:

#headerwrap {
    background-color: #F57300;
}

To add CSS:

• If you are using WordPress 4.7 or later, use the “Additional CSS” option in the customizer.
• If your theme has a custom CSS option, use that to add the CSS shown above.
• If not, install the plugin Simple Custom CSS.

Learn to use the Chrome Developer Tools to help you see and test changes to your CSS.

The header CSS worked but what about the side bar dividers and font lower down the page?

Learn to use the Chrome Developer Tools to help you see and test changes to your CSS.