body {
  background-color: #000;
}

#app {
  display: none;
}

div.container_app {
  display: flex;
  visibility: hidden;
  width: 80%;
  margin: 10% auto;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

div.container_app p {
  color: #fff;
  font-family: Tahoma, Geneva, Verdana, sans-serif;
  display: block;
  text-align: center;
}

div.container_app img.system {
  width: 100px;
  margin: 50px auto;
}

div.container_app img.logo {
  width: 80px;
  margin: 25px auto;
}

div.container_app a.download {
  font-family: Tahoma, Geneva, Verdana, sans-serif;
  margin: auto auto 10px auto;
  width: 150px;
  outline: none;
  font-weight: 500;
  color: #f1f1f1;
  border: none;
  height: 35px;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9em;
  cursor: pointer;
  transition-duration: 0.3s;
  text-decoration: none;
  user-select: none;
}

div.container_app a.enter {
  font-family: Tahoma, Geneva, Verdana, sans-serif;
  margin: auto auto 10px auto;
  width: 150px;
  outline: none;
  font-weight: 500;
  color: #f1f1f1;
  border: solid thin #fff;
  height: 35px;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9em;
  cursor: pointer;
  transition-duration: 0.3s;
  text-decoration: none;
  user-select: none;
}

div.container_app button:hover {
  transform: scale(1.1);
}