wxmini/pages/piano/firmware/firmware.wxss

.top_item {
  display: flex;
  justify-content: space-between;
  text-align: center;
  color: #797979;
  font-size: 30rpx;
  padding: 20rpx 40rpx 20rpx 40rpx;
}

.top_item_left {
  color: black;
  font-size: 35rpx;
}

.update {
  margin-top: 100rpx;
  align-items: center;
  display: flex;
  justify-content: center;
}

.update>view {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 520rpx;
  height: 80rpx;
  border-radius: 45rpx;
  font-size: 35rpx;
  font-weight: 400;
  color: #FFFFFF;
}

.update>view.action {
  background: #6547A3;
}