同じv-rowの中に入れ込む

<v-form v-model="valid" v-col>
                            <v-container>
                                <v-row>
                                    <v-col cols="12" md="3">
                                        <v-text-field v-model="firstname" :rules="nameRules" :counter="10" label="施主名" required></v-text-field>
                                    </v-col>
    
                                    <v-col cols="12" md="3">
                                        <v-text-field v-model="lastname" :rules="nameRules" :counter="10" label="戸主名" required></v-text-field>
                                    </v-col>
    
                                    <v-col cols="12" md="3">
                                        <v-text-field v-model="email" :rules="emailRules" label="住所" required></v-text-field>
                                    </v-col>
                                    <v-btn cols="12" md="3" class="ma-2" :loading="loading" :disabled="loading" color="secondary" @click="loader = 'loading'">
                                        Accept Terms
                                    </v-btn>
                                </v-row>
                            </v-container>
                        </v-form>