button states css - SERP Analysis

https://zellwk.com/blog/style-hover-focus-active-states/

https://www.w3schools.com/css/css3_buttons.asp

https://www.uxpin.com/studio/blog/button-states/

https://www.freecodecamp.org/news/css-button-style-hover-color-and-background/

https://www.digitalocean.com/community/tutorials/how-to-use-links-and-buttons-with-state-pseudo-classes-in-css

https://www.designrush.com/best-designs/websites/trends/button-states

https://tailwindcss.com/docs/hover-focus-and-other-states

https://developer.mozilla.org/en-US/docs/Web/CSS/Pseudo-classes

https://medium.com/weave-lab/interaction-states-for-dummies-designers-f743c682fae1

https://css-tricks.com/so-many-states/