revision:
<form accept-charset="character_set">
The character_set is a space-separated list of one or more character encodings that are to be used for the form submission.
Common values are UTF-8 - character encoding for Unicode, ISO-8859-1 - character encoding for the Latin alphabet.
In theory, any character encoding can be used, but no browser understands all of them. The more widely a character encoding is used, the better the chance that a browser will understand it.
<form style="margin-left:5vw;" action="/action_page.php" accept-charset="utf-8">
<label for="fname">First name:</label>
<input type="text" id="fname" name="fname"><br><br>
<input type="submit" value="Submit">
</form>
<form style="margin-left:5vw;"action="#" accept-charset="UTF-8">
First name:<input type="text" name="fname">
<br>
Last name:<input type="text" name="lname">
<br>
<input type="submit" value="Submit">