I don't know what to do again as i have tried all possible means to solve the task all to no avail

Tell us what’s happening:
Describe your issue in detail here.

   **Your code so far**
/* file: index.html */
<!DOCTYPE html>
<html>
 <head>
   <title>Registration Form</title>
	  <link rel="stylesheet" type="text/css" href="styles.css" />
 </head>
 <body>
   <h1>Registration Form</h1>
   <p>Please fill out this form with the required information</p>
   <form action='https://register-demo.freecodecamp.org'>
     <fieldset>
       <label>Enter Your First Name: <input type="text" name="first-name" required /></label>
       <label>Enter Your Last Name: <input type="text" name="last-name" required /></label>
       <label>Enter Your Email: <input type="email" name="email" required /></label>
       <label>Create a New Password: <input type="password" name="password" pattern="[a-z0-5]{8,}" required /></label>
     </fieldset>
     <fieldset>
       <label><input type="radio" name="account-type" class="inline" /> Personal Account</label>
       <label><input type="radio" name="account-type" class="inline" /> Business Account</label>
       <label>
         <input type="checkbox" name="terms" class="inline" required /> I accept the <a href="https://www.freecodecamp.org/news/terms-of-service/">terms and conditions</a>
			  </label>
     </fieldset>
     <fieldset>
       <label>Upload a profile picture: <input type="file" name="file" /></label>
       <label>Input your age (years): <input type="number" name="age" min="13" max="120" />
			  </label>
       <label>How did you hear about us?
         <select name="referrer">
           <option value="">(select one)</option>
           <option value="1">freeCodeCamp News</option>
           <option value="2">freeCodeCamp YouTube Channel</option>
           <option value="3">freeCodeCamp Forum</option>
           <option value="4">Other</option>
         </select>
       </label>
       <label>Provide a bio:
         <textarea name="bio" rows="3" cols="30" placeholder="I like coding on the beach..."></textarea>
			  </label>
     </fieldset>
     <input type="submit" value="Submit" />
   </form>
 </body>
</html>
/* file: styles.css */
body {
 width: 100%;
 height: 100vh;
 margin: 0;
 background-color: #1b1b32;
	color: #f5f6f7;
 font-family: Tahoma;
	font-size: 16px;
}

h1, p {
 margin: 1em auto;
 text-align: center;
}

form {
 width: 60vw;
	max-width: 500px;
	min-width: 300px;
	margin: 0 auto;
}

fieldset {
 border: none;
	padding: 2rem 0;
}

fieldset:not(:last-of-type) {
 border-bottom: 3px solid #3b3b4f;
}

label {
 display: block;
	margin: 0.5rem 0;
}

input,
textarea,
select {
 margin: 10px 0 0 0;
	width: 100%;
 min-height: 2em;
}

input, textarea {
 background-color: #0a0a23;
 border: 1px solid #0a0a23;
 color: #ffffff;
}

.inline {
 width: unset;
 margin: 0 0.5em 0 0;
 vertical-align: middle;
}

input[type="submit"] {
 display: block;
 min-width: 300px;
 margin-top : 1px;
  margin-bottom : 1px;
 height: 2em;
 font-size: 1.1rem;
 background-color: #3b3b4f;
 border-color: white;

}

   **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36

Challenge: Step 54

Link to the challenge:

The challenge demand you use em units instead of px

You don’t have to introduce margin-top and margin-bottom properties, the task asks you to modify “margin” shorthand property that you already have.

Don’t know if your problem is with the margin or the width. If it is the margin do as the other responses said. If it’s the width you are probably looking for the property “min-width”