The banner section and the course section should have the same background color because both sections make the visitor want to learn. Other sections offer pieces of information to help the visitor to make up their mind to start learning. Consequently, the guest lecture section should also have the same background color as the banner and the course section, because the lecture makes the visitor want to learn something. This is why all these three sections have the sky blue background to convey the same message: let's learn something new!
The banner section and the course section should have the same background color because both sections make the visitor want to learn. Other sections offer pieces of information to help the visitor to make up their mind to start learning. Consequently, the guest lecture section should also have the same background color as the banner and the course section, because the lecture makes the visitor want to learn something. This is why all these three sections have the sky blue background to convey the same message: let's learn something new!