.credits {
	display: none;
}

nav > button:nth-of-type(1) {}
nav > button:nth-of-type(2) {}
nav > div:nth-of-type(1) > button:nth-of-type(1) {}
nav > div:nth-of-type(1) > button:nth-of-type(2) {}
nav > div:nth-of-type(2) > button:nth-of-type(1) {}
nav > button:nth-of-type(3) {}