fix(elevation): change elevations to match spec (#1857)

Author: mmalerba

src/lib/button/_button-base.scss

@@ -88,6 +88,8 @@ $md-mini-fab-padding: 8px !default;
 @mixin md-fab($size, $padding) {
   @extend %md-raised-button;
 
+  @include md-elevation(6);
+
   // Reset the min-width from the button base.
   min-width: 0;
 
@@ -98,6 +100,10 @@ $md-mini-fab-padding: 8px !default;
 
   flex-shrink: 0;
 
+  &:active {
+    @include md-elevation(12);
+  }
+
   i, md-icon {
     padding: $padding 0;
     line-height: $md-icon-button-line-height;

src/lib/card/card.scss

@@ -8,7 +8,7 @@ $md-card-border-radius: 2px !default;
 $md-card-header-size: 40px !default;
 
 md-card {
-  @include md-elevation(1);
+  @include md-elevation(2);
   @include md-elevation-transition;
   display: block;
   position: relative;
@@ -17,10 +17,6 @@ md-card {
   font-family: $md-font-family;
 }
 
-md-card:hover {
-  @include md-elevation(2);
-}
-
 .md-card-flat {
   box-shadow: none;
 }

src/lib/core/style/_menu-common.scss

@@ -13,7 +13,7 @@ $md-menu-font-size: 16px !default;
 $md-menu-side-padding: 16px !default;
 
 @mixin md-menu-base() {
-  @include md-elevation(2);
+  @include md-elevation(8);
   min-width: $md-menu-overlay-min-width;
   max-width: $md-menu-overlay-max-width;
 
@@ -86,4 +86,4 @@ $md-menu-side-padding: 16px !default;
       transform-origin: left bottom;
     }
   }
-}
+}

src/lib/sidenav/sidenav.scss

@@ -20,12 +20,12 @@
     transform: translate3d($close, 0, 0);
   }
   &.md-sidenav-opening {
-    @include md-elevation(1);
+    @include md-elevation(16);
     visibility: visible;
     transform: translate3d($open, 0, 0);
   }
   &.md-sidenav-opened {
-    @include md-elevation(1);
+    @include md-elevation(16);
     transform: translate3d($open, 0, 0);
   }
 }
@@ -132,4 +132,4 @@ md-sidenav {
 
 .md-sidenav-invalid {
   display: none;
-}
+}

src/lib/snack-bar/snack-bar-container.scss

@@ -7,7 +7,7 @@ $md-snack-bar-max-width: 568px !default;
 
 
 :host {
-  @include md-elevation(24);
+  @include md-elevation(6);
   background: #323232;
   border-radius: 2px;
   box-sizing: content-box;