How can CSS be used to adjust the layout of form entries in PHP to avoid unsightly placement?

To adjust the layout of form entries in PHP and avoid unsightly placement, CSS can be used to style the form elements such as input fields, labels, and buttons. By applying CSS properties like margin, padding, and display to these elements, you can control their positioning and spacing within the form layout.

<!DOCTYPE html>
<html>
<head>
    <style>
        form {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        input {
            margin-bottom: 10px;
            padding: 5px;
        }
        
        label {
            margin-bottom: 5px;
        }
        
        button {
            padding: 5px 10px;
        }
    </style>
</head>
<body>
    <form action="submit.php" method="post">
        <label for="username">Username:</label>
        <input type="text" id="username" name="username">
        
        <label for="password">Password:</label>
        <input type="password" id="password" name="password">
        
        <button type="submit">Submit</button>
    </form>
</body>
</html>