Fix button styles

themes/starter/source/assets/scss/modules/_buttons.scss

@@ -13,7 +13,7 @@
   text-align: center;
   text-decoration: none;
   font-size: .85rem;
-  margin: 4em .4em 0;
+  margin: 1.5em .4em 0;
   border: none;
   padding-top: 4px;
   background: black;
@@ -75,7 +75,6 @@
   z-index: $zIndex--3;
   background-color: rgba($white, .25);
   display: inline-block;
-  margin-left: -2.5em;
 }
 
 .i-sidebar .hidden:checked + .popup {

themes/starter/source/assets/scss/modules/_sidebar.scss

@@ -97,7 +97,7 @@
 }
 
 @media screen and (max-width: $mq-xsmall) {
-  .share-wrapper .u-extra {
+  .u-extra {
     margin-bottom: 0;
   }
 

themes/starter/source/assets/scss/partials/_layout.scss

@@ -153,7 +153,7 @@ dfn {
     &:active,
     &:focus {
       background: $black;
-      box-shadow: 0px 2px 4px 0px $asphalt;
+      box-shadow: 0px 2px 4px 0px $grey;
     }
 }
 

themes/starter/source/assets/scss/partials/_utils.scss

@@ -16,6 +16,7 @@
 .contents .u-extra {
   visibility: visible;
   opacity: 1;
+  margin-bottom: 2em;
 }
 
 .u-emphasize {