Fixed #1217

src/sass/cinnamon/_common.scss

@@ -1268,7 +1268,10 @@ StScrollBar {
     max-width: 28em;
   }
 
-  .confirm-dialog-title { text-align: center; }
+  .confirm-dialog-title {
+    @extend %title_2;
+    text-align: center;
+  }
 }
 
 
@@ -1298,15 +1301,62 @@ StScrollBar {
   }
 }
 
+// End session dialog
+
+.end-session-dialog {
+  min-width: 40em;
+
+  .dialog-content-box { spacing: 0; }
+
+  .dialog-list {
+    spacing: 0;
+
+    .dialog-list-title {
+      color: $warning_color;
+      background-color: tranparentize($warning_color, 0.9);
+      padding: $base_padding * 1.5;
+      border-radius: $bt_radius;
+      margin: $base_margin 0;
+    }
+  }
+}
+
+// message dialog
+
+.message-dialog-content {
+  spacing: $base_padding * 3;
+
+  .message-dialog-title {
+    text-align: center;
+    @extend %title_2;
+
+    &.lightweight { @extend %title_4; }
+  }
+
+  .message-dialog-description { text-align: center; }
+
+  .message-dialog-caption {
+    @extend %caption; 
+    text-align: center;
+  }
+}
+
 //
 // Run dialog
 //
 .run-dialog {
-  padding: 0px 15px 10px 15px;
+  .dialog-content-box {
-  background-color: $bg_color;
+    margin: $base_margin;
-  border-radius: $bt_radius;
+  }
 
-  > * { padding: 0; }
+  &-description {
+    @extend %caption;
+
+    text-align: center;
+    color: darken($text_color, 20%);
+
+    &.error { color: $error_color; }
+  }
 
   &-label {
     font-size: 0;
@@ -1319,15 +1369,18 @@ StScrollBar {
 
   &-error-box {
     padding-top: 15px;
-    spacing: 5px;
+    spacing: $base_padding;
   }
+
   &-completion-box {
-    padding-left: 15px;
+    padding-top: $base_padding;
-    font-size: 10px;
+    padding-left: $base_padding * 2;
   }
+
   &-entry {
     width: 21em;
-    padding: 7px;
+    height: 1.2em;
+    padding: $base_padding;
     border-radius: $bt_radius;
     caret-color: $osd_fg_color;
     selected-color: $selected_fg_color;
@@ -1337,6 +1390,8 @@ StScrollBar {
 
     &:focus { @include entry(osd-focus); }
   }
+
+  .dialog-button-box,
   .modal-dialog-button-box {
     border: none;
     box-shadow: none;
@@ -1345,6 +1400,78 @@ StScrollBar {
   }
 }
 
+// password or authentication dialog
+
+.prompt-dialog {
+  width: 26em;
+
+  .dialog-content-box {
+    spacing: $base_margin * 4;
+    margin-bottom: $base_margin * 3;
+  }
+
+  &-password-entry {
+    @extend %entry;
+    width: 20em;
+  }
+
+  &-password-layout { spacing: $base_margin * 2;}
+
+  &-error-label,
+  &-info-label,
+  &-null-label {
+    text-align: center;
+    @extend %caption;
+  }
+
+  &-error-label { color: $error_color; }
+}
+
+// polkit dialog
+
+.polkit-dialog {
+
+  &-user-layout {
+    text-align: center;
+    spacing: 2px;
+  }
+
+  &-user-combo {
+    @extend %flat_button;
+    @extend %heading;
+
+    border-radius: $bt_radius;
+    padding: $base_padding $base_padding * 6;
+
+    // special case the :insensitive button sinc we want
+    // the label to be the normal color when there are
+    // not multiple users
+    &:insensitive { color: $text_color; }
+  }
+}
+
+// Audio selection dialog
+
+.audio-device-selection-dialog {
+  min-width: 24em;
+
+  .audio-selection-box {
+    spacing: $base_padding *2;
+
+    .audio-selection-device {
+      @extend %flat_button;
+      border-radius: $bt_radius;
+
+      .audio-selection-device-box {
+        padding: $base_padding * 2;
+        spacing: $base_padding * 2;
+      }
+
+      .audio-selection-device-icon { icon-size: 64px; }
+    }
+  }
+}
+
 /* CinnamonMountOperation Dialogs */
 .cinnamon-mount-operation-icon {
   icon-size: 48px;