body,textarea{
  background-color: black;
  font-size: 20px;
  color: white;
  font-family: "游明朝", YuMincho, "ヒラギノ明朝 ProN W3", "Hiragino Mincho ProN", "HG明朝E", "MS P明朝", "MS 明朝", serif;
}