sass: simpify more definitions

Change-Id: I8d861d7fd49f79c062b8be6230178e1e496205e7

src/sass/classic_admin.scss

@@ -202,11 +202,7 @@ div.setting_element {
 }
 /* On screens that are less than 700px wide, make the sidebar hidden */
 @media screen and (max-width: 700px) {
-  .adminsidebar {
-    display: none;
-    padding-top: 5em;
-  }
-
+  .adminsidebar,
   #adminsidebar {
     display: none;
     padding-top: 5em;

src/sass/modern_squared_style.scss

@@ -1,11 +1,7 @@
 @import 'modern_style';
 @import 'partials/squared_gallery';
 .divinnen2 {
-  position: absolute;
-  bottom: 0;
-  right: 0;
   left: 0;
-  padding: 10px;
   margin-left: auto;
   margin-right: auto;
 }

src/sass/rounded.scss

@@ -25,10 +25,7 @@
 }
 
 .gallery {
-  &__close {
-    border-radius: 5px;
-  }
-
+  &__close,
   &__reload {
     border-radius: 5px;
   }
@@ -43,27 +40,18 @@
 }
 
 .admin-panel,
-.manual-panel {
+.manual-panel,
+.login-panel {
   border: 0 none;
   border-radius: 10px;
 }
 
 .panel {
-  .panel-heading {
-    margin-top: 2px;
-    border-radius: 5px;
-  }
-
+  .panel-heading,
   .panel-body {
-    margin-top: 1px;
+    margin-top: 2px;
     border-radius: 5px;
   }
-}
-
-.login-panel {
-  border: 0 none;
-  border-radius: 10px;
-}
 
 button {
   border: 2px solid $borderColor;
@@ -81,12 +69,7 @@ button {
   border-radius: 5px;
 }
 
-.slider::-webkit-slider-thumb {
-  width: 20px;
-  height: 20px;
-  border-radius: 50%;
-}
-
+.slider::-webkit-slider-thumb,
 .slider::-moz-range-thumb {
   width: 20px;
   height: 20px;