Anders.
It works!
1) The black background on the blog-menu is not fully black. I changed it to be so as follows:
.blog-menu {
display: flex;
flex-wrap: wrap;
list-style: none;
background-color: #000000;
margin-left: -0px
}
2) The problem now is that the parts outside the blog-menu is still greyish black and I have not figured how to make it so. Any solutions?
3) Can you also make the header to be sticky together with the blog-menu?