html,
body {
  height: 100%;
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

a {
  color: inherit;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  flex-flow: column;
}

header, #gallery {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

img {
  opacity: 0.0
}

img.active {
  /* z-index: 0; */
  margin: auto;
  max-height: 100%;
  max-width: 100%;
  position:absolute;
  top:0;
  left:0;
  right:0;
  bottom:0;
  opacity: 0.9
}

h1 {
  margin: 0;
}

footer {
  background: #AAC
}

/*  Home */
body.home h1 {
  /* position: fixed;
  z-index: 10;
  top: 10px;
  left: 10px; */
  margin: 10px 20px;
}

header {
  margin: 10px 20px;
}

/* @media only screen and (max-width: 600px) {} */