Hello everyone

I try to change the Stucco Theme. (Live Demo:https://stucco.onside-lab.com/en)...
When you open the live demo there is written "stucco" on the first page. It has a transparent background and a white border. I'd like to delete those two things.
When I inspect the item i get the following two classes who set the following:
.front-page .header-logo {
float: none;
width: 30%;
margin: 0 auto 20px;
color: #fff;
text-align: center;
background: rgba(0,0,0,0.3);
border: solid 2px #fff;
position: absolute;
left: 0;
right: 0;
top: 20%;
z-index: 5;
}

Now I can override the css with my personal css code in the custom css. But it doesnt work for me. Does anyone can help?

(I use concrete5 8.2.1)

Thanks for any help.

Daniel