body, html {
  background: #555;
  font-family: "Courier New", Courier, monospace;
  height: 100%;
  margin: 0;
}

.va-fileinput {
  left: 10px;
  position: absolute;
  top: 10px;
  z-index: 33;
}

.va-img-holder {
  height: 100%;
  position: relative;
}

.va-img-holder__shutter {
  background: #000 url("kreis400px.png") center no-repeat;
  color: grey;
  line-height: 100vh;
  position: absolute;
  height: 100%;
  width: 100%;
  z-index: 22;
}

/* adapt size of shutter image (the "o") to small screeens */
@media(max-width:500px) {
  .va-img-holder__shutter {
    background-size: 75%;
  }
}

.va-img-holder img, .va-img-holder video {
  /* https://stackoverflow.com/questions/7273338/how-to-vertically-align-an-image-inside-a-div */
  max-height: 100%;
  max-width: 100%;
  width: auto;
  height: auto;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  /* suppresses tooltip */
  pointer-events: none;
  z-index: 11;
}

.va-menu {
  align-items: center;
  bottom: 10px;
  display: flex;
  position: absolute;
  right: 10px;
  z-index: 33;
}

.va-menu>* {
  background: transparent;
  color: #fff;
  font-family: inherit;
  font-size: inherit;
}

.va-button-show-image {
  cursor: pointer;
}

.va-input-shutterspeed {
  border: 1px solid transparent;
  border-bottom: 1px solid white;
  width: 66px;
}

.va-button-reveal-image {
  border: none;
  color: #999;
  cursor: pointer;
  margin-left: 10px;
}