Answers for "button border color change"

border buttom color

div {
	border-bottom-color: coral;
}

onclick button border color change

function clickimageone(el){
	el.style.border = "1px solid blue";
	document.getElementById("border2").className="borderorange";
}

onclick button border color change

.border1{
	border: 1px solid red;
}
.border2{
	border: 1px solid red;
}
.bordeorange{
	border: 1px solid orange;
}