.intro {font-size: 24px;line-height: 130%;font-weight: 600;color: #000000;padding: 0 0 20px;}
.purpose {height: 500px;}
.purpose img {width: 100%;height: 100%;object-fit: cover;    object-position: bottom;}


@media (max-width: 768px) {
	.purpose {height: calc(500/768*100vw)}
}