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Please read carefully this DOC about how to create Child Themes with WordPress:
It elaborates step by step how to proceed.
It is important to understand the code suggested there, as some details need to be changed/adapted and can not be used one by one (copy and paste)
I see in your Child Theme on your site that you did not enqueue your Child Theme's Stylesheet.
The DOC I provided elaborates on how to do that.
Also note that WordPress uses a "cascading" precedence system in cases of enqueueing scripts.
As example, if you enqueue Style Sheets or other styles, it will follow this "precedence":
1. First line (first enqueue) is loaded before, but "overwritten" by rules of...
2. The second line (or second enqueue) which is overwritten as well by...
3. The next line, etc.
That means, all styles you have on your LAST line in the enqueue script (is enqueued last) will Overwrite all precedent styles, if some CSS is "duplicated"
That means, your CUSTOM style sheet should ALWAYS be the last to be enqueued, so to ensure that all precedent CSS can be overwritten by your custom css.
Studying your functions.php file I also saw CRED API codes.
Please be careful by naming functions with the SAME name
Each Function in WordPress must have a unique name, otherwise you will receive fatal errors.
This is just a side-inforamtion, to avoid complications while developing your site.
Please let me know if you have further questions regarding the issue mentioned in this Thread
Thank you for your patience.