Ah, yeah, again not your own work and you did not read the license terms for use of the material you found at Icons8.
The Creative Commons Attribution-NoDerivs 3.0 Unported human-readable summary of license states:
You are free to:
Share — copy and redistribute the material in any medium or format
for any purpose, even commercially.
The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:
Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
NoDerivatives — If you remix, transform, or build upon the material, you may not distribute the modified material.
Full license appears here:
https://creativecommons.org/licenses/by-nd/3.0/legalcode
. . .
These are so simplistic in design would it not have simply been better to create your own?
Why do you insist on using other people's work?
. . .