Regarding Tables, Rules and Header

[bitterlord]

I have been trying to change some things on my theme and had some problems regarding that. First of all I cant change the colors of the TABLE's, and it looks bad since it's background merges with background of the site itself (I don't know coding jargon, sorry). The code I am using for this is:

table { border-collapse: collapse; width: 50%; width: auto; min-width: 65%; margin: 0 auto; }

table th, td { border: 1px solid #ffffff; }

table th { color: #0e0e0e; background-color:#fedd59; background-image: url('https://cdn.discordapp.com/attachments/1117902933594492998/1134557994126946374/bd48da_02456bfba66a4022b40985bc3c89375fmv2.png'); background-clip: text; background-size: 25%; font-weight: 700; font-family: var(--title-font); text-transform: uppercase; }

Second problem is with Rules, I dont know which code edits them, can you help about it? It doesn't suit with my pursuit of modernising the site

Third is regarding the Header, how can I get rid of the outer black line

Thanks in advance