Anyone can tell me please where is the color of SimpleStorage.sol is red? please gimme the answer

[DsAvay]

[alfaqi]

this is warning, you have to provide the license identifier, like this
SPDX-License-Identifier: MIT

Warning: SPDX license identifier not provided in source file. Before publishing, consider adding a comment containing "SPDX-License-Identifier: <SPDX-License>" to each source file. Use "SPDX-License-Identifier: UNLICENSED" for non-open-source code. Please see https://spdx.org for more information.

[DsAvay]

Can you please tell me how can I solve this problem?

[alfaqi]

first of all this is warning not error
means the code will works fine, to solve this problem just write
//SPDX-License-Identifier: MIT at first line of your code
MIT or any license provider (that's depends on you)

[kamalchakma1]

@DsAvay Try to write SPDX license and Solidity version