Challenge Website design system

can someone please help me? I don’t know what I’m doing wrong.

html>
  <head>
    <title>Angelica's Website Design System</title>
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
    <h1>Angelica's Website Design System</h1>
    <div class="box">
      <h1>Colors</h1>
    <div class="container">
      <p>Blue</p>
      <div class="container">
        <p>Pink</p>
      </div>
      </div>
      </div>
  </body>
</html>

.box {
width: 700px;
height: 700px;
border: 1px solid black;
padding: 30px;
margin: 30px;
}
.container {
width: 50px;
height: 50px;
border: 1px solid black;
padding: 10px;
margin: 10px;
background-color: blue;
}
.container {
width: 50px;
height: 50px;
border: 1px dotted black;
padding: 10px;
margin: 10px;
background-color: pink;
}

This is my finished project of my website design. If you have any tips on how I can make it better, please let me know.

<html>
  <head>
    <title>Angelica's Website Design System</title>
    <link rel="stylesheet" href="styles.css" />
    <link rel="preconnect" href="https://fonts.googleapis.com" />
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
    <link
      href="https://fonts.googleapis.com/css2?family=Merriweather:ital@0;1&family=Roboto&family=Space+Mono&family=Work+Sans:wght@400;500;800&display=swap"
      rel="stylesheet"
    />
  </head>
  <body>
    <h1>Angelica's Website Design System</h1>
    <div class="container">
      <h1>Colors</h1>
      <div class="box1">Blue #0000FF</div>
      <div class="box2">Pink #FFC0CB</div>
      <div class="box3">Yellow Green #9ACD32</div>
      <div class="box4">Tan #D2B48C</div>
    </div>
    <div class="container 2">
      <h1>Fonts</h1>
      <span style="font-family:Roboto"><u>Roboto</u></span>
      <br />
      <br />
      <span style="font-family:Roboto"
        >The quick brown fox jumps over the lazy dog.</span
      >
      <br />
      <br />
      <span style="font-family:Roboto"
        ><b>The quick brown fox jumps over the lazy dog.</b></span
      >
      <br />
      <br />
      <span style="font-family:Roboto"
        ><i>The quick brown fox jumps over the lazy dog.</i></span
      >
      <br />
      <br />
      <span style="font-family:Merriweather"><u>Merriweather</u></span>
      <br />
      <br />
      <span style="font-family:Merriweather"
        >The quick brown fox jumps over the lazy dog.</span
      >
      <br />
      <br />
      <span style="font-family:Merriweather"
        ><b>The quick brown fox jumps over the lazy dog.</b></span
      >
      <br />
      <br />
      <span style="font-family:Merriweather"
        ><i>The quick brown fox jumps over the lazy dog.</i></span
      >
      <br />
      <span style="font-family:Space Mono"><u>Space Mono</u></span>
      <br />
      <br />
      <span style="font-family:Space Mono"
        >The quick brown fox jumps over the lazy dog.</span
      >
      <br />
      <br />
      <span style="font-family:Space Mono"
        ><b>The quick brown fox jumps over the lazy dog.</b></span
      >
      <br />
      <br />
      <span style="font-family:Space Mono"
        ><i>The quick brown fox jumps over the lazy dog.</i></span
      >
      <br />
      <br />
      <span style="font-family:Work Sans"><u>Work Sans</u></span>
      <br />
      <br />
      <span style="font-family:Work Sans">
        The quick brown fox jumps over the lazy dog.</span
      >
      <br />
      <br />
      <span style="font-family:Work Sans"
        ><b>The quick brown fox jumps over the lazy dog.</b></span
      >
      <br />
      <br />
      <span style="font-family:Work Sans"
        ><i>The quick brown fox jumps over the lazy dog.</i></span
      >
      <br />
    </div>
    <div class="container 3">
      <div class="Text Styles">
        <h1>Text Styles</h1>
        <h1>H1: Main page heading</h1>
        <ul>
          <li>Font-weight: 700(bold)</li>
          <li>Font-size: 26px</li>
          <li>Font-family: Work Sans</li>
        </ul>
        <h2>H2: Subheading</h2>
        <ul>
          <li>Font-weight: 500</li>
          <li>Font-size: 18px</li>
          <li>Font-family:Roboto</li>
        </ul>
        <h3>P:Paragraph text</h3>
        <ul>
          <li>Font-weight: 400(regular)</li>
          <li>Font-size: 14px</li>
          <li>Font-family:Space Mono</li>
        </ul>
      </div>
    </div>
  </body>
</html>
container {
  width: 700px;
  height: 700px;
  border: 1px solid black;
  padding: 30px;
  margin: 30px;
}
.box1 {
  width: 250px;
  height: 65px;
  border: 1px solid black;
  padding: 10px;
  margin: 10px;
  float: center;
  background-color: blue;
}
.box2 {
  width: 250px;
  height: 65px;
  border: 1px solid black;
  padding: 10px;
  margin: 10px;
  float: center;
  background-color: pink;
}
.box3{
  width: 250px;
  height: 65px;
  border: 1px solid black;
  padding: 10px;
  margin: 10px;
  float: center;
  background-color: yellowgreen;
}
.box4{
  width: 250px;
  height: 65px;
  border: 1px solid black;
  padding: 10px;
  margin: 10px;
  float: center;
  background-color: tan;
}
 .h1,ul{
  font-weight: 700px bold;
  font-size: 26px;
  font-family: Work Sans;
 }
 .h2,ul{
  font-weight: 500px;
  font-size: 18px;
  font-family: Roboto;
 }
 .p,ul{
  font-weight: 400px;
  font-size: 14px;
  font-family: Space Mono;
 }

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