Your not going to get an answer to this, there is no magic wand you can use to change what your asking without working it out yourself, or at the very least supplying some actual code with your question.
To change the CSS in a back-end option page you can use the Options API, http://codex.wordpress.org/Options_API, or write a custom CSS file and include it in your header.
As Mark already mentioned there is a color picker that comes with WordPress that you can use to fill in your custom field options with color values.
Related Posts:
- Alignment Problem [closed]
- What is an alternative to not using child theme to customize a WordPress theme?
- How to customize the colors within a stylesheet using a WordPress setting
- how can I re-utilize and class on a child theme
- Theme.json: creating different sections of the color palette
- WordPress API Menu/Submenu Order
- Child Theme vs Duplicate Theme Renamed
- What WP folder can I use to write files to?
- How to: Update live sites theme from version control repo via plugin or library? [closed]
- Setting multiple default background images?
- Best practice way to implement custom sections into a WordPress theme
- How to edit bbPress template files – WordPress + BuddyPress + bbPress? [closed]
- Where is default wp_head() implemented?
- Add a preview to a WordPress Control Panel
- How to deploy a new theme/theme options from staging to production site
- WordPress Customizer Typography: How to load just the unique Google Fonts?
- use add_action(‘wp_head’) in a widget for generating dynamic CSS styles
- How do I get my child-theme to work with my theme’s includes folder?
- CSS in child theme not overriding the parent theme [closed]
- WordPress Errors in generated by theme check plugin [closed]
- WordPress Theme customisation CSS
- Optimal solution to develop a wordpress theme?
- When developing a distributable Theme, does it HAVE to be “inheritable”?
- Nesting Functions within Functions
- Select front page and blog page in custom theme settings page
- De-registering parent style sheet css recommended?
- Can I customize any WordPress parent block-based theme template files by child theme like a parent classic theme?
- WordPress Multisite: Have the same header and footer of main-blog on all sub-blogs
- Using the theme options to change background
- How Can I Create a List of Values to Be Iterated Through via WordPress Customization API?
- Is there a way to activate different theme for specified users? [closed]
- how can I remove the sidebar from my wp homepage [closed]
- Unhook action from child theme
- Does any theme support child theme?
- Am I supposed to create a child theme for every theme I use?
- How to Edit the style of header title of Twenty Eleven Theme?
- Is there an action for save_menu and/or update_menu?
- Set multiple templates per post
- Creating Theme Options Page
- Location of theme options page menu icon
- get_option in header.php not returning value from customizer
- What happens to child theme if I change to new version of parent theme?
- Internal error 500 accessing Theme > Customize
- Using an if statement in the theme customizer page
- How to add “Template” option in page attributes panel?
- Category specific themes?
- Why is it needed to enqueue parent stylesheet in child theme?
- How can I make my options in an array and store theme in WP options one DB row?
- How to show custom meta_key in each li of menu
- Following Web Performance Optimization techniques to output static and dynamic css
- How to enqueue javascript for WP Customize options sidebar?
- How do i place same widgets multiple time by default on theme activation?
- Common single page template options
- How to support letting users add their OWN logo to a custom theme?
- Replace function in a child theme
- Can’t remove DIV from hooks in Storefront child theme [closed]
- Change WordPress header color using customizer
- Derive child theme from separate theme
- How do I use a color from theme options?
- How to Create custom xml file for demo content for custom theme?
- How to create and populate with few links a menu in child theme functions.php?
- Create a child theme from multiple themes
- How to make javascript work on theme options page
- get_template_part() doesn’t work
- Consequences if using PHP include TEMPLATEPATH?
- Copying the theme style files and images to duplicate the website but with a difference
- Why still output /wp-content/themes/twentynineteen?
- not getting API setting saved confirmation message after update on option page
- Questions from a new WP Dev [closed]
- Do I need to re-import Susy to work with it in a child theme? [closed]
- Unable to change the priority with ‘remove_action’ and ‘add_action’ in child theme
- Translate a child theme with pure PHP and gettext
- Let user to add input fields on theme option page
- What might cause a featured image not to display?
- Converting a theme to a child theme in a network
- Creating an advanced searchform based on select boxes
- Tabbed theme options query about add_settings_section callback function
- Why my theme option not working?
- Understrap-child conditional js script
- In wordpress customizer div still showing even if I hid it with javascript
- Want to know how to reveal a WordPress theme, considering the theme name is hidden?
- How can I access variables from theme in child theme? [closed]
- How to display home page last modified date in anywhere of wordpress theme?
- Child theme menu not appearing in Twenty Seventeen
- Edit Product Archive design for Woo theme
- Duplicate child theme incl. design changes
- Move the social media icons to the left of a WordPress nav menu for Soledad child Theme
- How to connect two child themes on different sub domains to the same base theme
- how to create export / import theme options in wordpress without plugin
- How can I include the js and css file of my custom theme dynamically in header.php
- How to migrate the menu from the site on my own theme in WordPress?
- trying to figure out how to use more that one image upload in the same section in theme customizer
- Extending arrays in parent theme without completely overriding the files
- The content not wrapped in paragraph tags with get_page_by_title()
- Import/Export WordPress demo
- WordPress theme Modifications not showing up on live server
- add_action works outside condition but not inside it
- Global Navigation menu in diiferrent wordpress setups
- Should I create a child theme for a parent custom theme? [closed]
- Remove nonindex meta tag