Style fixes for tools & 404 page:

- Set Bootstrap colors for background colors
- Adjust button padding to work in more contexts
- Removed unused tool CSS. Migrated some styles to SCSS.
- Fix sticky overlap in faucets sidebar
- Make 404 page inherit from base template

styles/_dev-tools.scss

@@ -11,44 +11,7 @@
   top: 16px;
 }
 
-/* Progress spinner animation */
-@keyframes rotating {
-    from {
-        transform: rotate(0deg);
-        -ms-transform: rotate(0deg);
-        -moz-transform: rotate(0deg);
-        -webkit-transform: rotate(0deg);
-        -o-transform: rotate(0deg);
-    }
-    to {
-        transform: rotate(360deg);
-        -ms-transform: rotate(360deg);
-        -moz-transform: rotate(360deg);
-        -webkit-transform: rotate(360deg);
-        -o-transform: rotate(360deg);
-    }
-}
-
-@-webkit-keyframes rotating /* Safari and Chrome */ {
-    from {
-        transform: rotate(0deg);
-        -ms-transform: rotate(0deg);
-        -moz-transform: rotate(0deg);
-        -webkit-transform: rotate(0deg);
-        -o-transform: rotate(0deg);
-    }
-    to {
-        transform: rotate(360deg);
-        -ms-transform: rotate(360deg);
-        -moz-transform: rotate(360deg);
-        -webkit-transform: rotate(360deg);
-        -o-transform: rotate(360deg);
-    }
-}
-
-.page-test-net .throbber,
-.page-tx-sender .throbber,
-.interactive-block .throbber {
+.throbber {
   width: 24px;height:24px;
 }
 
@@ -94,3 +57,45 @@
     }
   }
 }
+
+
+#rest_url_wrapper p {
+  margin: 0;
+  border-radius: 4px;
+  // $code-bg and $code-padding are from _code-tabs.scss
+  background-color: $code-bg;
+  padding: $code-padding;
+  overflow: auto;
+}
+
+#rest_url {
+  width: auto;
+  border: 0;
+  background: none;
+  font-size:13px;
+  vertical-align: top;
+
+  .editable {
+    color: $white;
+    font-weight: bold;
+    font-family: $font-family-monospace;
+    border-width: 0 0px 1px 0;
+    border-style: dotted;
+    border-color: $gray-200;
+    min-width: 5em;
+    background: none;
+    vertical-align: top;
+  }
+
+ .non_editable {
+    vertical-align: top;
+  }
+
+  div {
+    display: inline-block;
+  }
+
+  input {
+    margin: 0 !important;
+  }
+}