html {background:rebeccapurple;}

body {
	padding:40px;
	width:40%;
	margin: auto;
	font-family: sans-serif;
	background:mistyrose;
}

header img {
  width:214px;
  position:relative;
  left:calc(50% - 107px);
}

h1,h2 {text-align:center;}

.gallery img {
  margin:20px;
  width:100px;
  box-shadow:2px 2px 6px #333;
  filter:brightness(100%);
  transition: filter .6s, margin .6s, width .6s;
}

.gallery img:hover {
  width:120px;
  margin:10px;
  filter:brightness(120%);
  transition:filter .3s, margin .3s, width .3s;
}