*,
*:before,
*:after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-user-select: inherit;
  -moz-user-select: inherit;
  -ms-user-select: inherit;
  user-select: inherit;
  -webkit-user-drag: inherit;
  -moz-user-drag: inherit;
  -ms-user-drag: inherit;
  user-drag: inherit;
}
* img {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.mask {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 99999;
  background: url(../../../pics/game_background.png) center / contain no-repeat;
}
.mask .outer {
  position: relative;
  width: 100%;
  height: 100%;
}
.mask .select .drop {
  position: absolute;
  top: 25%;
  left: 10%;
  width: 22.5vw;
  height: 12.8vw;
  cursor: pointer;
  z-index: 9;
}
.mask .select .drop img {
  height: 100%;
  max-width: inherit;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-user-drag: none;
  -moz-user-drag: none;
  -ms-user-drag: none;
  user-drag: none;
}
.mask .select .drop:nth-child(2) {
  left: 38%;
}
.mask .select .drop:nth-child(3) {
  left: 65.5%;
}
.mask .select .drop:nth-child(3) > img {
  height: 7.8125vw;
}
.mask .inner > a {
  position: absolute;
  width: 23.2vw;
  height: 13.4vw;
  top: 54%;
  left: 10.5%;
}
.mask .inner #box2 {
  left: 38%;
}
.mask .inner #box3 {
  left: 65.8%;
}
.tip2 {
  width: 300px;
  top: 2%;
}
.tip {
  width: 640px;
  text-indent: 2em;
  opacity: 0;
}
.tip.active {
  opacity: 1;
}
.paint_i {
  width: 100%;
  height: auto;
}
.btn_box {
  position: absolute;
  bottom: 7%;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.gameBox_btn {
  width: 19.1vw;
  height: 6.875vw;
  margin-top: 2%;
}
.gameBox_btn:last-child {
  margin-left: 5%;
}