body {
  background-color: black;
}

#logo {
  width: 100%;
}

.center {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
}

button {
  background-color: #2222ee;
  border: ridge black;
  color: #eeeeee;
  font-size: 150%;
  font-weight: bold;
  margin: 5px;
}

a:visited {
  color: #aaaaaa;
}

#menu {
  text-align: center;
}