Minor improvements in UI (#1399)

web/html/login.html

@@ -123,8 +123,9 @@
     background-origin: border-box;
     background-clip: padding-box, border-box;
     background-size: 300%;
-    transition: all 0.5s ease;
+    transition: all 0.3s cubic-bezier(.645,.045,.355,1);
     width: 100%;
+    z-index: 1;
   }
   .dark .wave-btn-bg:hover {animation: wave-btn-tara 4s ease infinite;}
   .dark .wave-btn-bg-cl {
@@ -289,7 +290,7 @@
                         </a-form-item>
                         <a-form-item>
                             <a-row justify="center" class="centered">
-                                <div class="wave-btn-bg wave-btn-bg-cl">
+                                <div class="wave-btn-bg wave-btn-bg-cl" :style="loading ? { width: '54px' } : { display: 'inline-block' }">
                                     <a-button class="ant-btn-primary-login" type="primary" :loading="loading" @click="login" :icon="loading ? 'poweroff' : undefined"
                                               :style="loading ? { width: '50px' } : { display: 'inline-block' }">
                                         [[ loading ? '' : '{{ i18n "login" }}' ]]