Can anyone help me code a customized login system linked to a database?
Ii have the front end created. See screenshot:
Why creating a custom login-page, when it is of the same Design like the standard one? You loose the ability of using a google-login and fb-loogin.
You will have to create it all by your own (what is surely not the easiest task)!
If you are calling the page-layout as —> frontend, than you are wrong. Frontend has nothing to do with design.
Frontend is used in JS-Coding-language.
How should I proceed?
Did you already setted-up a Member-Area?
To be found in your Wix-Editor.
Click on → +
Navigate to very bottom, in your case it should be → “MEMBER” (see position of mouse-curse on screenshot). Sorry i am working in GERMAN 
A selfmade LOGIN-PAGE could for example look like this one… (my own one, which is still in DEVELOPEMENT)…
https://www.media-junkie.com/login-page
You can use the TEST-USER/GUEST-USER ACCOUNT to inspect the functionality.
@russian-dima The members site will include a lot of charts and multiple articles.
What do you mean?
And how i should understand your statement, as an advantage or disatvantage?
Please elaborate. I still do not understand the main issue.
@russian-dima Did you use any code for your login page?
I mean when you designed your login page did you use any code?
I used almost (90%) → JUST PURE JS-CODE.
Everything i do is → CUSTOM & from scratch (no predefined stuff).
I want to be flexibel when i design my pages or features.
The rest of 10% is the connection to PMD and Wix-CRM, but also coded 
What JS-code did you use?
What is PMD?
I have about 1000-lines of code for the shown Login&Registration-Module.
PMD → PrivateMembersData
This is a database which will be added automaticaly when you add the wix Member-Area into your site.
It’s very similar to Wix-CRM (Contacts-section).
If you want to build a similar one you should start from SCRATCH.
Here on my old site, you will find the first steps, how to generate a custom Login-page. This is the way, how i begun coding my own LOGIN…
For my login page I am following MS’s video tutorial at: Adding A Custom Member Login and Page Restrictions in Wix | A COMPLETE Guide 2021 - Wix.com - YouTube