body {
  background: transparent;
}
.back_img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.game_content {
  position: relative;
  margin: 18.5% auto 0;
  width: 88%;
}
.inp_box {
  width: 100%;
}
.inp_box>textarea {
  width: 100%;
  font-size: 2.8125vw;
  line-height: 1.6;
  border: none;
  resize: none;
  background: transparent;
  text-indent: 21em;
}
.btn_box {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.gameBox_btn {
  width: 19.1vw;
  height: 6.875vw;
  margin-top: 6%;
}