You can use this tool to achieve effect.
#1. First, access this tool.
#2. Click Create widget for free
#3. Choose desired layout then click Continue with this template.
#4. Upload your music, adjust layout, style then click Add to website for free
#5. Click Publish on top right
#6. Choose Free Plan then Copy Embed Code
#7. Add embed code to Website Tools > Code Injection > Footer
#8. Result
It will appear on bottom right of site.
and continue player when you access other pages.