Another Styling stuff i dont understand

Question

Help me how to make a nav bar in the header that is in 1 line and each one has background color 0f white and i want the header to be semi-transparent and the text or logo not in the edge but near middle

Answer 1

one line
display : inline
background color
Background-color : white ;
semi transparent
opacity: 0.5;
middle
header {text-align:center}

Answer 2

don't use float
use flexbox
https://code.sololearn.com/WERY1LRN72N2/?ref=app
https://code.sololearn.com/Wqwc2gEQ7sR7/?ref=app

Answer 3

i want the text/logo "Near" the middle and when i use float: right; on nav the list is out of the box and the border is not visible