.box{
  width: 85%;
  height: 360px;
  background-color: #fff;
}
.i-modal-mask {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  transition: all 0.2s ease-in-out;
  opacity: 0;
  visibility: hidden;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.i-modal-mask-show {
  opacity: 1;
  visibility: visible;
}
.title{
  width: 100%;
  text-align: center;
  margin: 20px 0;
}
.item{
  text-align: center;
  line-height: 50px
}
.intro {
  margin: 30px;
  text-align: center;
}