.masker-toast{

    position: fixed;

    width: auto;

    max-width: 710rpx;

    height: 80rpx;

    line-height: 80rpx;

    padding: 0 20rpx;

    bottom: 120rpx;

    left: 50%;

    transform: translateX(-50%);

    background: rgba(0, 0, 0, .6);

    z-index: 9999;

    color: #fff;

    border-radius: 10rpx;

}

<view class='masker-toast' wx:if="{{showToast}}">{{toastMsg}}</view>