header, h1 { text-align: center; }
.button {
	display: inline-block;
	padding: 0.5em;
	font-size: large;
	border-radius: 8px;
	border: 3px outset;
}
.button:hover, .button:focus { border-style: inset; }
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
}
.box { border: 10px inset; padding: 10px; }
h2 { margin: 0; }
.size-img { width: 100%; }