body {
  margin: 0;
  padding: 0;
  max-width: 100%;
  overflow: hidden;
  font-family: Noto Sans JP;
  animation: fadeIn 2.5s cubic-bezier(0.33, 1, 0.68, 1) forwards;
  text-align: center;
  background-color: #212121;
}

a {
  text-decoration: none;
  display: inline-block;
  line-height: 0;
  font-size: 0;
}

p, h1 {
  color: #FFFFFF;
}
  
.header-iframe {
  position: fixed;
  width: 100%;
  height: 100px;
  border: none;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
}

main {
  padding-top: 100px;
  max-width: 100%;
}
  
.windowsonly {
  font-weight: normal;
  text-align: center;
  margin-top: 125px;
}

.simple_notepad_thumbnail {
  display: block;
  margin: 0 auto 10px auto;
  font-weight: bold;
  border: solid 3px #000000;
  border-radius: 10px;
  overflow: hidden;
  max-width: 375px;
  width: 80%;
}

.copyright, .show {
  text-align: center;
}
  
footer {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  background-color: #171717;
}

@keyframes fadeIn {
  0% {
    opacity: 0;
  }
  
  100% {
    opacity: 1;
  }
}