Help With Header Media Link Text

Hi. I'm using the free version of Corporate Fotografie and need help with the media link text -specifically adding color to the box background. You can't see the text because of the background image, even when I update the color of the header media text. I'm hoping I can add a background color to the box (similar to how it looks when you toggle over it). You can view the page here (where it says Join the Effect) https://everesteffect.com/ Also, can you change the position of the media link text/box? Ideally keeping it center, but moving it up or down. thanks!