Copyright (c) 2021 by Kyle Wetton (https://codepen.io/kylewetton/pen/bGbobMa)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
The MIT License (MIT)

Copyright (c) 2014 Brenna O'Brien

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Code created with the help of Stack Overflow question:
https://stackoverflow.com/questions/67985538/change-the-colour-of-a-specific-area-of-a-picture-onclick

Question by user8:
https://stackoverflow.com/users/16017912/user8

Answer by user863:
https://stackoverflow.com/users/8053274/user863

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License
Code created with the help of Stack Overflow question:
https://stackoverflow.com/questions/68007444/how-to-add-or-remove-using-id-instead-of-classes

Question by user8:
https://stackoverflow.com/users/16017912/user8

Answer by thilankad:
https://stackoverflow.com/users/4423695/thilankad

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License
Code created with the help of Stack Overflow question:
https://stackoverflow.com/questions/68103509/how-to-select-multiple-classes-onclick-and-change-the-colours-when-selected

Question by user8:
https://stackoverflow.com/users/16017912/user8

Answer by user11229156:
https://stackoverflow.com/users/user11229156

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License
Code created with the help of Stack Overflow question:
https://stackoverflow.com/questions/68195625/css-grid-and-flex-box-not-working-cannot-move-items

Question by user8:
https://stackoverflow.com/users/16017912/user8

Answer by g-cyrillus:
https://stackoverflow.com/users/2442099/g-cyrillus

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License
Code created with the help of Stack Overflow question:
https://stackoverflow.com/questions/68416739/how-to-select-and-then-deselect-area

Question by user8:
https://stackoverflow.com/users/16017912/user8

Answer by Alexander Nied:
https://stackoverflow.com/users/6831341/alexander-nied

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License