wxsapp/SuperBrain/app.wxss

/**app.wxss**/
.container {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 200rpx 0;
  box-sizing: border-box;
} 
.placeholder-default{
  color: #cccccc;
}
.dialog{
  position: fixed;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
}
.dialog-main{
  position: relative;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.dialog-close{
  display: block;
  width: 64rpx;
  height: 64rpx;
  margin: 40rpx auto 0;
}