if you want to remove the parts that I have a mark in the second screenshot
Please try this CSS, this code will help you to rid of that part

#stats-section{
    display:none
}

the previous CSS that I have given to you is for the first screenshot

Regards,
Psink

Add this CSS code – for menu text color

.main-navigation a{
    color: #fff;
}

.main-navigation a:hover,
.menu-inside-wrapper .main-navigation>.nav-menu>.current_page_item>a{
	color: #f8732b !important;
}

Add this CSS – for logo

.custom-logo {
    max-width: 100% ;
}

Have a great day

Regards,
Psink

Hello Martin

Please remove the previous CSS of the footer text color and Add this CSS

.site-info,
.site-info a{
    color: #fff;
} 

.site-info a:hover{
    color: #f8732b;
}

Have a good day

Regards,
Psink

Hello marissa mancini

The gray bar is displaying from the widgets. Can you please check the widgets, to do so
go to Admin Panel >> Appearance >> Customize >> Widgets, there you will find footer 1, footer 2, footer 3, footer 4

Please check all the footer widgets, I’m quite sure the gray bar is displaying through one of the footer widgets.

Or you can add Additional CSS to rid it of.

aside.widget-area.footer-widget-area.one {
    display: none;
}

You can add the above CSS in the Additional CSS to rid of the gray bar

Hope this helps

Regards,
Psink

Hello Ronald

Please add this Css in the theme – to remove the banner image that you have indicated as don’t want

div#page-site-header {
    display: none;
}

To add this in the theme, please go to Admin Panel >> Appearance >> Customize >> Additional CSS, there paste the above css and published

Can you please share a screenshot for this “I would also like to remove the big grey colored box at the top of any pages I create without a featured image…”

Regards,
Psink

Hello Kirsty Lord

Ahh, so you have created a homepage manually using page builder and now you want to display it rather than the theme default homepage

Please follow the screen record
https://www.awesomescreenshot.com/video/2646840?key=366a85a1e185ff1b3a111a703dd23e4a

hope this helps you

Regards
Psink

Hello @omnisector

Can you please share site URL?

Regards,
Psink