Update login page. New private key validation rule

Author: 4ban

src/pages/Login.vue

@@ -2,17 +2,17 @@
   <q-layout>
     <q-page-container>
       <q-page class="bg-vblack">
-        <div class="row">
-          <div class="col background-gradient q-pa-xl text-center window-height">
+        <div class="row background-gradient window-height items-center">
+          <div class="col text-center q-pa-xl">
             <q-img src="statics/icons/icon-512x512.png" spinner-color="vdark" style="height: 150px; max-width: 150px" />
             <div class="text-h5 text-vdark"><span class="text-weight-bolder">vDexNode</span> dashboard</div>
             <div class="text-subtitle1 text-vdark">Rent your computer to earn VTX</div>
           </div>
-          <div class="col bg-white q-pa-xl window-height">
+          <div class="col q-pa-xl">
             <div class="text-h5">Import private key</div>
             <div class="text-subtitle2">Please enter your private key below to start working with vDexNode Dashboard. We will never save or transmit your your key.</div>
             <q-form @submit="login()">
-              <q-input dense v-model="privateKey" :type="isPwd ? 'password' : 'text'" counter color="vdark" ref="input" @keyup.enter="login" label="Your private key" :rules="[ val => val && val.length <= 51 || 'Wrong key']">
+              <q-input dense v-model="privateKey" :type="isPwd ? 'password' : 'text'" counter color="vdark" ref="input" @keyup.enter="login" label="Your private key" :rules="[ val => val.length <= 51 || 'Wrong key']">
                 <template v-slot:append>
                   <q-icon :name="isPwd ? 'visibility_off' : 'visibility'" class="cursor-pointer" @click="isPwd = !isPwd" />
                 </template>