How change color of <button onclick >?

Question

I have SOME <button> and want to change their color
https://code.sololearn.com/WoMjqavLSdr8/?ref=app

Answer 1

Could you describe more? What button do you mean? And which colour do you want to change?

https://www.sololearn.com/discuss/1316935/?ref=app

Answer 2

You can do in the onclick attribute:

"minus(this)"

JS:
function minus(obj) {
//code
obj.style.background = "red";
}
(this will change the background permanently)

Or, better, with CSS with active:

button:active {
background: red;
}
(this will only change it while you are clicking on it)

Answer 3

Thanks, but something is wrong. It doesn't show this color

Answer 4

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