html, body {height: 100%;}

.intro {
	display: flex;
	height: 100%;
	align-items: center;
	justify-content: center;
}

.intro-box {

}
.intro-box span {
	position: relative;
	font-size: 40px;
	font-weight: bold;
	opacity: 0;
}

.intro-1 {
	color: #444;
}
.intro-2 {
	color: #f6a828;
}
.intro-3 {
	color: #444;
}

@media (max-width: 767px)
{
	.intro-box span {
		font-size: 24px;
	}
}