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HTML 

              
                <main>
  
  <h1>Your Account</h1>
  
  <form action="" method="post">
    
    <nav>
      <a href="#0" class="active">Sign In</a>
      <a href="#0">Create Account</a>
    </nav>
    
    <div class="form-field">
      <label for="email">Email Address</label>
      <input type="email" id="email" name="email">
    </div>
    
    <div class="form-field">
      <label for="password">Password</label>
      <input type="password" id="password" name="password">
    </div>
    
    <input type="submit" value="Sign In" class="button">
    
  </form>
  
  <a href="#0" class="forgot-password">Forgot your password?</a>
  
</main>
!

CSS 

              
                /* This ruleset is the only thing added to the original Pen... to get the boxes+dots at the corners of the form */
form {
  --line: linear-gradient(to right, var(--brown), var(--brown));
  --dot: radial-gradient(circle, rgb(170, 139, 89) 1px, rgba(170, 139, 89, 0) 1px);
  
  --box: 
    var(--line),
    var(--line),
    var(--dot);
  
  --box-size:  
    2px 10px,
    12px 2px,
    10px 10px;
  
  background-repeat: no-repeat;
  
  background-image: 
    var(--box),
    var(--box),
    var(--box),
    var(--box);
  
  background-size:
    var(--box-size),
    var(--box-size),
    var(--box-size),
    var(--box-size);
  
  background-position:
    /* top left */
    10px 0px,
    0px 10px,
    0px 0px,
    /* top right */
    right 10px top 0px,
    right 0px top 10px,
    100% 0%,
    /* bottom left */
    left 10px bottom 0px,
    left 0px bottom 10px,
    0% 100%,
    /* bottom right */
    right 10px bottom 0px,
    right 0px bottom 10px,
    100% 100%;
}

form {
  border: 7px double #AA8B59;
  padding: 3rem;
}



:root {
  --brown: #AA8B59;
  --gray: rgb(14, 19, 25);
  --gray--t: rgba(14, 19, 25, 0);
  --body-font: 'Josefin Sans', sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  font-family: var(--body-font);
  font-size: 90%;
  color: white;
  text-align: center;
  background: var(--gray)  url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" width="28" height="49" viewBox="0 0 28 49"%3E%3Cg fill-rule="evenodd"%3E%3Cg id="hexagons" fill="%239C92AC" fill-opacity="0.1" fill-rule="nonzero"%3E%3Cpath d="M13.99 9.25l13 7.5v15l-13 7.5L1 31.75v-15l12.99-7.5zM3 17.9v12.7l10.99 6.34 11-6.35V17.9l-11-6.34L3 17.9zM0 15l12.98-7.5V0h-2v6.35L0 12.69v2.3zm0 18.5L12.98 41v8h-2v-6.85L0 35.81v-2.3zM15 0v7.5L27.99 15H28v-2.31h-.01L17 6.35V0h-2zm0 49v-8l12.99-7.5H28v2.31h-.01L17 42.15V49h-2z"/%3E%3C/g%3E%3C/g%3E%3C/svg%3E');
}

body {
  margin: 0;
  height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(
    var(--gray) 30%, var(--gray--t)
  );
}

main {
  width: 600px;
  @media(max-width: 610px) {
    width: 320px;
    form { padding: 2rem; }
    nav { display: flex; justify-content: space-between; }
    nav a { margin: 0; }
  }
}

h1 {
  font-family: 'Crimson Text', serif;
  font-size: 3.4rem;
  letter-spacing: -0.06rem;
}

nav {
  text-transform: uppercase;
  letter-spacing: 0.1rem;
  margin: 0 0 2rem 0;
  a {
    display: inline-block;
    padding: 0.3rem 0;
    margin: 0 1rem;
    &.active {
      border-bottom: 2px solid var(--brown);
    }
  }
}
a {
  color: inherit;
  text-decoration: none;
}

.form-field {
  margin: 0 0 1rem 0;
  &:focus-within {
    label {
      color: white;
    }
  }
}
label {
  display: block;
  text-align: left;
  color: #7C7C7C;
}
input {
  width: 100%;
  background: none;
  border: 2px solid #7C7C7C;
  padding: 1.5rem;
  &:focus {
    border-color: white;
    outline: 0;
  }
}

.button {
  background: var(--brown);
  color: white;
  border: 0;
  font-family: var(--body-font);
  text-transform: uppercase;
  padding: 1.5rem;
  font-size: 1.0rem;
  letter-spacing: 0.1rem;
}

.forgot-password {
  display: block;
  margin: 2rem 0;
  text-transform: uppercase;
  letter-spacing: 0.1rem;
  opacity: 0.9;
}
!

JS
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