QQ Online Customer Service Code with a Hideable QR Code

QQ online customer service code with a hideable QR code, including QQ online consultation, WeChat QR code display, a back-to-top button, and a customer service hotline number. Compatible with major browsers.
Usage:
1. Include the style.css stylesheet in the head section.
2. Include jquery-1.8.3.min.js and lrtk.js in the head section.
3. Add the code from the commented section <!-- Code Start --><!-- Code End --> to your webpage.
4. Simply modify the QQ number, phone number, and WeChat QR code image.
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I encountered a few minor issues when adding this to my website.
1. It is recommended to rename style.css, as this filename is too generic and may conflict with existing stylesheets.
2. The default z-index value of main-im in the stylesheet is 100. My website apparently already uses this value, causing the div not to display. Changing it to 101 or higher solved the problem.