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                <v-app id="app">
      <v-container class="back" fill-height fluid>
        <v-row align="center" justify="center">
          <v-col cols="12">
            <v-dialog width="20%" v-model="alert">
                  <v-btn color="green darken-1" @click="alert = false" dark>Ok</v-btn>
          <v-col cols="5">
            <v-card class="card-login mx-a">
              <v-card-text class="pa-5">
                <v-form v-on:submit="sub" action="#" method="post">

                  <v-text-field color="green darken-1" v-model="login" label="User"></v-text-field>
                  <v-text-field color="green darken-1" v-model="senha" label="Password"></v-text-field>
                  <v-btn class="green darken-1" type="submit" large dark>Let's go</v-btn>




                html, body{
  width: 100%;
  heigh: 100%;
  margin: 0;
  padding: 0;
  background-image: url('');
  background-size: cover;
  background-repeat: no-repeat;

@keyframes opacity-in {
  from {opacity: 0.4;}
  to {opacity: 1;}

@keyframes opacity-out {
  from {opacity: 1;}
  to {opacity: 0.4;}

  opacity: 0.4;
  animation-name: opacity-out;
  animation-duration: 2s;

  opacity: 1;
  animation-name: opacity-in;
  animation-duration: 2s;

  animation-name: opacity-in;
  animation-duration: 2s;


                new Vue({
  el: "#app",
  vuetify: new Vuetify(),
      login: "",
      senha: "",
      log: "",
      alert: false
  methods: {
      sub: function(event){
          if(this.login == "" || this.senha == ""){
            this.alert = true
            this.log = "User and Password is required."
            this.log = "Go"