Unnest top level selectors from body

app/assets/stylesheets/common/base/discourse.scss

@@ -45,63 +45,65 @@ html {
 }
 
 body {
-  h1, h2, h3, h4, h5, h6 {
-    margin-top: 0;
-    margin-bottom: .5rem;
-  }
-
   background-attachment: fixed;
   background-size: cover;
   min-height: 100%;
 
   @include clearfix;
+}
 
-  button.ok {
+h1, h2, h3, h4, h5, h6 {
+  margin-top: 0;
+  margin-bottom: .5rem;
+}
+
+button.ok {
   background: $success;
   color: $secondary;
   @include hover {
     background: lighten($success, 10%);
     color: $secondary;
   }
-  }
-  button.cancel {
+}
+
+button.cancel {
   background: $danger;
   color: $secondary;
   @include hover {
     background: lighten($danger, 10%);
     color: $secondary;
   }
-  }
+}
 
-  // the default for table cells in topic list
-  // is scale-color($primary, $lightness: 50%)
-  // numbers get dimmer as they get colder
-  .coldmap-high {
+// the default for table cells in topic list
+// is scale-color($primary, $lightness: 50%)
+// numbers get dimmer as they get colder
+.coldmap-high {
   color: dark-light-choose(scale-color($primary, $lightness: 70%), scale-color($secondary, $lightness: 30%)) !important;
-  }
-  .coldmap-med {
+}
+.coldmap-med {
   color: dark-light-choose(scale-color($primary, $lightness: 60%), scale-color($secondary, $lightness: 40%)) !important;
-  }
-  .coldmap-low {
+}
+.coldmap-low {
   color: dark-light-choose(scale-color($primary, $lightness: 50%), scale-color($secondary, $lightness: 50%)) !important;
-  }
+}
 
-  #loading-message {
+#loading-message {
   position: absolute;
   font-size: 2.143em;
   text-align: center;
   top: 120px;
   left: 500px;
   color: $primary;
-  }
+}
   .top-space {
   margin-top: 10px;
-  }
-  ul.breadcrumb {
+}
+ul.breadcrumb {
   margin: 0 10px 0 10px;
-  }
+}
 
-  .message {
+.message {
   @include border-radius-all(8px);
   background-color: $secondary;
   padding: 14px;
@@ -109,9 +111,9 @@ body {
   h2 {
     margin-bottom: 20px;
   }
-  }
+}
 
-  #footer {
+#footer {
   .container {
     height: 50px;
     .contents {
@@ -121,13 +123,13 @@ body {
       }
     }
   }
-  }
+}
 
-  .clear-transitions {
+.clear-transitions {
   transition:none !important;
-  }
+}
 
-  .tip {
+.tip {
   display: inline-block;
   &.good {
     color: $success;
@@ -135,31 +137,31 @@ body {
   &.bad {
     color: $danger;
   }
-  }
+}
 
-  input[type].invalid {
+input[type].invalid {
   background-color: dark-light-choose(scale-color($danger, $lightness: 80%), scale-color($danger, $lightness: -60%));
-  }
+}
 
-  .d-editor-input {
+.d-editor-input {
   resize: none;
-  }
+}
 
-  .avatar-wrapper {
+.avatar-wrapper {
   background-color: $secondary;
   display: inline-block;
   border-radius: 50%;
-  }
+}
 
-  .profiler-results.profiler-left {
+.profiler-results.profiler-left {
   top: 60px !important;
-  }
+}
 
-  label {
+label {
   display: block;
   margin-bottom: 5px;
-  }
-  input {
+}
+input {
   &[type="radio"], &[type="checkbox"] {
     margin: 3px 0;
     line-height: normal;
@@ -168,29 +170,28 @@ body {
   &[type="submit"], &[type="reset"], &[type="button"], &[type="radio"], &[type="checkbox"] {
     width: auto;
   }
-  }
-  .radio, .checkbox {
+}
+.radio, .checkbox {
   min-height: 18px;
   padding-left: 18px;
-  }
-  .radio input[type="radio"], .checkbox input[type="checkbox"] {
+}
+.radio input[type="radio"], .checkbox input[type="checkbox"] {
   float: left;
   margin-left: -18px;
-  }
-  .controls > {
+}
+.controls > {
   .radio:first-child, .checkbox:first-child {
     padding-top: 5px;
   }
-  }
-  .radio.inline, .checkbox.inline {
+}
+.radio.inline, .checkbox.inline {
   display: inline-block;
   padding-top: 5px;
   margin-bottom: 0;
   vertical-align: middle;
-  }
-  .radio.inline .radio.inline, .checkbox.inline .checkbox.inline {
+}
+.radio.inline .radio.inline, .checkbox.inline .checkbox.inline {
   margin-left: 10px;
-  }
 }
 
 .flex-center-align {