body {
  font-family: -apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'Segoe UI', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
  background: #333;
  color: white;
  font-size: 2vmin;
  margin: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100vh;
}

.center {
  text-align: center;
}

.bold {
  font-weight: bold;
}

.red {
  color: red;
  background: white;
}

a {
  text-decoration: none;
  color: lightblue;
}

ul {
  list-style: none;
}

#iconContainer {
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

#iconContainer li {
  padding: 1px;
  box-sizing: border-box;
  display: inline-flex;
  justify-content: center;
}

#iconContainer img {
  background: white;
  width: 96px;
  height: 96px;
  border-radius: 50%;
}

#katagami {
  background: white;
}

#katagami, #katagamiContainer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
}

#katagamiContainer {
  width: 100vmax;
  height: 100vmax;
}

#size-up, #size-down, #download, #rotate {
  background: lightseagreen;
  color: white;
  font-size: 5.5vmin;
  font-weight: bold;
  position: fixed;
  bottom: 2vmin;
  width: 12vmin;
  height: 12vmin;
  border-radius: 10vmin;
  display: flex;
  align-items: center;
  justify-content: center;
}

#size-up {
  right: 2vmin;
}

#size-down {
  left: 2vmin;
}

#download {
  top: 2vmin;
  right: 2vmin;
  background: deepskyblue;
}

#rotate {
  background: darkorange;
  top: 2vmin;
  left: 2vmin;
}

.deg90 {
  transform: rotate(90deg);
}

.deg180 {
  transform: rotate(180deg);
}

.deg270 {
  transform: rotate(270deg);
}