refactor login.jinja

core/static/user/login.scss

@@ -37,8 +37,7 @@ body {
       margin: 0;
     }
 
-    >div,
-    >form {
+    form {
       box-sizing: border-box;
       display: flex;
       flex-direction: column;
@@ -52,7 +51,7 @@ body {
       input[type="submit"] {
         width: 100%;
         max-width: 300px;
-        margin: 0;
+        margin-top: 1em;
       }
 
       .errorlist {
@@ -68,6 +67,10 @@ body {
       .captcha {
         box-sizing: border-box;
 
+        fieldset {
+          margin-bottom: unset
+        }
+
         >img {
           width: 70px;
           object-fit: contain;