@import url('https://fonts.googleapis.com/css2?family=Patua+One&display=swap');

html {
	font-size: 62.5%;
}
body {
	margin: 0;
	font-size: 1.5rem;
}
*, *::before, *::after {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
p {
	margin: 0 1em 1em;
}
h3 {
	margin: 1em;
	font-size: 1.7rem;
}
img {
	width: 100%;
	height: auto;
	vertical-align: top;
}
.contents {
	max-width: 630px;
	margin: 0 auto;
	padding: 20px;
	background: #f2f2f2;
}
.title {
	margin: 0 0 1em;
	font-weight: bold;
}
.container {
	display: flex;
	flex-wrap: wrap;
	justify-content: flex-start;
}
.box {
	width: calc(25% - 30px / 4);
	margin: 0 10px 10px 0;
	border: 1px solid #ddd;
	background: #fff;
}
.box:nth-child(4n) {
	margin: 0 0 10px 0;
}
@media screen and (max-width: 768px) {
	.box {
		width: calc(100% / 3 - 20px / 3);
	}
	.box:nth-child(3n) {
		margin: 0 0 10px 0;
	}
	.box:nth-child(4n) {
		margin: 0 10px 10px 0;
	}
	.box:nth-child(12) {
		margin: 0 0 10px 0;
	}
}

.photo {
	position: relative;
}
.photo:before {
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
	display: flex;
	justify-content: center;
	align-items: center;
	font-family: 'Patua One', cursive;
	font-size: 2rem;
	font-weight: 400;
	color: #fff;
	word-break: break-all;
	content: attr(data-index);
}

.copyright {
	text-align: center;
	padding-top: 2em;
	font-size: 14px;
}