Thread:Sleepy Soda/@comment-29703210-20170401125311/@comment-29703210-20170402091636

In case you wanna see my work: https://jsfiddle.net/mb9jab82/

Click on the first button so that it turns 'Green' (It changes the class of the element to 'checkTagActive' from 'checkTag'). Then click on the last button. (Here, it will check whether the class 'checkTagActive' exists in the first button 'checkButton1', and if it does, it adds the 'visible' class to 'checkButton4' so its visible.