Plugin settings won’t save changes

— You made a little mistake in code , I resolve this Error in the code So put this code —

function sswc_register_settings()
    {   
        register_setting('sswc_options_group', 'sswc_color_option');
        register_setting('sswc_options_group', 'sswc_top_option');
        register_setting('sswc_options_group', 'sswc_left_option');
    }

    add_action('admin_menu', 'sswc_register_settings_page');

    function sswc_register_settings_page()
    {
        add_options_page('Social Sharing with Claps', 'SSWC Settings', 'manage_options', 'sswc', 'sswc_options_page');
        add_action('admin_init', 'sswc_register_settings');
    }

    //Content for settings page will go here
    function sswc_options_page()
    {
        ?>
            <div class="settings-page-container">
                <h1>Social Sharing with Claps</h1>
                <h2>Settings</h2>

                <form method='post' action='options.php'>
                    <?php 
                        settings_fields('sswc_options_group');
                        do_settings_sections( 'sswc_options_group' );
                    ?>
                    <table>
                        <tr valign='top'>
                            <th scope="row"><label class="form-label" for="sswc_color_option">Color Value</label></th>
                            <td><input type="text" id='sswc_color_option' name="sswc_color_option" value=<?php echo get_option('sswc_color_option');?>></td>
                        </tr>
                        <tr valign='top'>
                            <th scope="row"><label class="form-label" for="sswc_top_option">Top Offset</label></th>
                            <td><input type="text" id='sswc_top_option' name="sswc_top_option" value=<?php echo get_option('sswc_top_option');?>></td>
                        </tr>
                        <tr valign='top'>
                            <th scope="row"><label class="form-label" for="sswc_left_option">Left Offset</label></th>
                            <td><input type="text" id='sswc_left_option' name="sswc_left_option" value=<?php echo get_option('sswc_left_option');?>></td>
                        </tr>
                    </table>
                    <?php  submit_button(); ?>
                </form>

            </div>
        <?php
    }

Output :

[Refer This Link :] https://codex.wordpress.org/Creating_Options_Pages