Removing border and text of collection section

[Dike]

Hello everyone,

I would like to have the border and text removed of these collection sections:

I was also wondering if it's possible to reduce the size of the images at about 50% . I tried to make the images smaller but they get very blurry. If there's a way around this I would greatly appreciate it! 

Thank you very much!

URL: https://glowee.nl/

[Dike]

Still need help, thank you!

[Dike]

Anyone know how to do this? Would greatly appreciate it!

Password: 321