chore(login): update some classes (#130)

components/user/UserSignIn.vue

@@ -15,7 +15,7 @@ async function handleInput() {
 </script>
 
 <template>
-  <div text-center justify-center flex="~ col items-center gap2">
+  <div text-center justify-center items-center flex="~ col gap2">
     <div text-3xl mb2>
       Sign in
     </div>
@@ -24,7 +24,7 @@ async function handleInput() {
       <span op35 mr1 text-sm>https://</span>
       <input v-model="server" :placeholder="DEFAULT_SERVER" outline-none bg-transparent @input="handleInput">
     </div>
-    <button btn-solid mxa mt2 @click="oauth()">
+    <button btn-solid mt2 @click="oauth()">
       Sign in
     </button>
   </div>