2. To change the header section black color.

.inner-main-title{
  background: #fff;
 }

.inner-main-title .entry-title, .inner-main-title .page-title {
    color: #000 !important;
}

3. To change the menu in to lowercase.

.main-navigation li {
    text-transform: lowercase;
}

Hope, the above provided CSS codes will help you to make the section as your need.

Thank you

Hello David Jennings,
Try adding the below CSS codes on Appearance > Customize > Additional CSS.

@media only screen and (max-width: 500px) {
   .custom-logo {
    width: 120px;
 }
}

Hope, this will help to decrease the logo size on mobile.

Regards

Thank you so much for your kind words. We really appreciate it.

Thank you again.

Please add the below css codes on Appearance > Customize > Additional CSS

1.

.post, .page {
    border: none !important;
}

2. Please add he header image from appearance > customize > header options > header image and check that section. That header image will appear on every pages.

3. Try changing the Menu name from Appearance > Customize > Menu and change the menu level and try once.

Let us know how it works.

Regards
Acme Supports

Hello Ricardo Oliveira,
If you have the embed codes, can you please try once by using the Text Widget. Add that codes on the text widget and place that text widget on the required sidebars.
Let us know the results.

Regards

Hello guija75,
Thank you so much for using our theme Education Base. It may cause due to the below problems:
1. Is your site already have the data ?
2. Is your internet is too slow?
3. Have you downloaded the demo from our documentation page and upload that dummy data from Acme Demo Setup?
4. Is Education Base theme is activated on your Appearance > Themes
Please let us know the answers. We will do our best to help you for importing the dummy data.

Regards
Acme Supports

Hello @cnkaragiannopoulos,
Thank you so much for using our theme Corporate Plus. In the premium version, you will get the options to enable/disable link for such area. So we recommend you to check the premium version demo for it.
If you want to do it on free version, you need to customize the theme code. You can find the theme codes on acmethemes/sidebar-widget and check all the available widget and customize as your need.
Note: Child theme is recommended to customize theme.

Regards
Acme Supports