HTML/CSS how can I make this header?

This is what I currently have for my html:

Math

Art

Astronomy

LEONARDO DA VINCI

Anatomy

Inventions

Wiki

and for css:

header {

display: flex;

justify-content: space-around;

margin: 50px;

}

a {

text-decoration: none;

word-spacing: 2em;

justify-content: center;

}

.navbar-left {

margin: 50px 0;

padding: 25px 120px;

border-top: solid 1px;

border-bottom: solid 1px;

}

.navbar-right {

margin: 50px 0;

padding: 25px 120px;

border-top: solid 1px;

border-bottom: solid 1px;

}

h1 {

margin: 50px 0;

}

\begin{tabular}{ccc} Anatomy & Inventoions & Wiki \\ \hline \end{tabular}