fix: login style

src/design/var/breakpoint.less

@@ -3,11 +3,11 @@
 // =================================
 
 // Extra small screen / phone
-@screen-xs: 480px;
+@screen-xs: 320px;
 @screen-xs-min: @screen-xs;
 
 // Small screen / tablet
-@screen-sm: 576px;
+@screen-sm: 640px;
 @screen-sm-min: @screen-sm;
 
 // Medium screen / desktop
@@ -15,15 +15,15 @@
 @screen-md-min: @screen-md;
 
 // Large screen / wide desktop
-@screen-lg: 992px;
+@screen-lg: 960px;
 @screen-lg-min: @screen-lg;
 
 // Extra large screen / full hd
-@screen-xl: 1200px;
+@screen-xl: 1280px;
 @screen-xl-min: @screen-xl;
 
 // Extra extra large screen / large desktop
-@screen-2xl: 1600px;
+@screen-2xl: 1536px;
 @screen-2xl-min: @screen-2xl;
 
 @screen-xs-max: (@screen-sm-min - 1px);