ecuopha
Hi
On the homepage with slideshow it use gray background
Open template folder /css/custom.css file
create file if it does not exist and add this code
.has-slideshow .t3-header {
background: #eaeaea;
border-bottom-color: transparent;
}
change the color code as per needs.
max width of the logo container at the moment is 317px
In small screen you added a different small logo which is smaller in size. you can replace it, its same image that you added.