the basic idea is not bad! Now I will show you a solution to your problem and we will analyze all the components together.
Let's think about the structure of DIV. First you will need two divs with a reference class or reference ID and you want them to be arranged side by side.
To put them side by side you could create an additional parent div, of flexible type (called father).
We also need 2 texts. In this example I will use simple spans.
We also create a style.css file where we will store the style of our containers
So we can write this.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!-- Link your stylesheet -->
<link rel="stylesheet" href="style.css">
<title>Title</title>
<div id="father">
<div id="sonOne"><span>S</span></div>
<div id="sonTwo"><span class="fox">FOX.</span></div>
</div>
</head>
<body>
</body>
</html>
For the style instead, we need to assign the parent a flexible orientation and line type. For the style, on the other hand, we need to assign a flexible, row-type orientation to the parent. To the first div should be put the border and to the second div, the text inside should be bold
Create style.css and try all togheter. Run this!!!
#sonTwo,#sonOne {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
}
#sonTwo,#sonOne span {
font-size: 50px;
}
#father {
display: flex;
flex-direction: row;
}
#sonOne {
border: 2px solid black;
border-radius: 5px;
padding: 5px;
}
#sonTwo {
padding: 5px;
}
.fox {
font-weight: bold;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!-- Link your stylesheet -->
<link rel="stylesheet" href="style.css">
<title>Title</title>
<div id="father">
<div id="sonOne"><span>S</span></div>
<div id="sonTwo"><span class="fox">FOX.</span></div>
</div>
</head>
<body>
</body>
</html>
For the S on the other hand, you could assign a font from Google Fonts that we have the borders the way you like them