Want to create a frame for a navbar

[Edrol97]

I want to create a framing for a navbar on a particular page of my site similar to the one below. Currently the code I have is as follows:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="Grauniad.css" />
    <link rel="stylesheet" href="mainstyle.css" />
    <title>Grauniad</title>
  </head>
  <body>
    <div class="topnav">
      <a href="Hi.html"
        >Hello and welcome to another news site you didn't ask for!</a
      >
    </div>
    <header class="navbar">
      <div class="logo">
        <img
          style="float: right"
          src="img/background/The Grauniad logo.png"
          width="20%"
        />
      </div>
      <nav>
        <div class="box">
          <a class="Home" href="Hi.html">Home</a><a>|</a>
          <a href="about_me.html">About</a><a>|</a> <a href="Art.html">Art</a
          ><a>|</a> <a href="cv.html">Work</a><a>|</a>
          <a href="Games.html">Play</a><a>|</a>
        </div>
      </nav>
    </header>
  </body>
</html>

body {
  width: 100%;
  height: 100%;
  cursor: url(img/background/cursors/Mouse%20cursor);
}
@font-face {
  font-family: Guardian;
  src: url(Fonts/Guardian-Egyp-Web-Regular.ttf);
}
.navbar {
  background-color: #062962;
  width: 100%;
  height: 150px;
  padding-left: 2%;
}
.navbar a {
  color: white;
  font-family: Guardian;
  font-weight: 900;
  font-size: 5dvh;
  padding: 20px;
  float: left;
}
.navbar .Home a {
  padding-left: 40px;
}
.topnav {
  background-color: #0b1e47;
  width: 100%;
  top: 0%;
}
.topnav a {
  color: white;
  font-family: Guardian;
  font-size: 4dvh;
  font-weight: 900;
}
.box {
  width: 80%;
  height: 80%;
  border: 3px white;
  top: 0;
  right: 0;
  background-color: #062962;
}

 

[tomliv]

I want to create a framing for a navbar on a particular page of my site similar to the one below. Currently the code I have is as follows:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="Grauniad.css" />
    <link rel="stylesheet" href="mainstyle.css" />
    <title>Grauniad</title>
  </head>
  <body>
    <div class="topnav">
      <a href="Hi.html"
        >Hello and welcome to another news site you didn't ask for!</a
      >
    </div>
    <header class="navbar">
      <div class="logo">
        <img
          style="float: right"
          src="img/background/The Grauniad logo.png"
          width="20%"
        />
      </div>
      <nav>
        <div class="box">
          <a class="Home" href="Hi.html">Home</a><a>|</a>
          <a href="about_me.html">About</a><a>|</a> <a href="Art.html">Art</a
          ><a>|</a> <a href="cv.html">Work</a><a>|</a>
          <a href="Games.html">Play</a><a>|</a>
        </div>
      </nav>
    </header>
  </body>
</html>

body {
  width: 100%;
  height: 100%;
  cursor: url(img/background/cursors/Mouse%20cursor);
}
@font-face {
  font-family: Guardian;
  src: url(Fonts/Guardian-Egyp-Web-Regular.ttf);
}
.navbar {
  background-color: #062962;
  width: 100%;
  height: 150px;
  padding-left: 2%;
}
.navbar a {
  color: white;
  font-family: Guardian;
  font-weight: 900;
  font-size: 5dvh;
  padding: 20px;
  float: left;
}
.navbar .Home a {
  padding-left: 40px;
}
.topnav {
  background-color: #0b1e47;
  width: 100%;
  top: 0%;
}
.topnav a {
  color: white;
  font-family: Guardian;
  font-size: 4dvh;
  font-weight: 900;
}
.box {
  width: 80%;
  height: 80%;
  border: 3px white;
  top: 0;
  right: 0;
  background-color: #062962;
}

I'd suggest using a UL for your nav items and then you can apply borders to the LI elements. Of course you'll need to style the UL to be without bullets and horizontal. Pad the A elements to create your rectangular click areas.

<nav>
        <div class="box">
            <ul>
                <li><a class="Home" href="Hi.html">Home</a></li>
                <li><a href="Art.html">Art</a></li>
                <li><a href="cv.html">Work</a></li>
                <li><a href="Games.html">Play</a></li>
            </ul>
        </div>
    </nav>

ul{
            border-bottom: 1px solid black;
            display: flex;
            justify-content: flex-start;
            align-items: flex-end;
            list-style-type: none;
            margin: 0;
            padding: 0;

            li:not(:last-of-type){
                border-right: 1px solid black;
            }

            li a{
                display: block;
                padding: 5px 10px;
                text-decoration: none;
            }
        }

Adjust as needed