refactor(common): gc common.scss, organize styles in proper places

src/sass/views/amount.scss

@@ -1,4 +1,7 @@
 #view-amount {
+  .item-no-bottom-border + .item {
+      border-top: 0;
+  }
   .icon-bitpay-card {
     background-image: url("../img/icon-bitpay.svg");
   }

src/sass/views/onboarding/onboard-collect-email.scss

@@ -1,5 +1,14 @@
 #onboarding-collect-email {
   background: rgb(17, 209, 166);
+  .overlay {
+    position: absolute;
+    top:0;
+    left:0;
+    width:100%;
+    height: 100%;
+    background: rgba(0,0,0,.4);
+    z-index: 4;
+  }
   .scroll-content {
     margin-top: 0;
     height: 101%;

src/sass/views/tab-receive.scss

@@ -7,6 +7,9 @@
       }
     }
   }
+  .border-top{
+    border-top:1px solid rgb(228,228,228);
+  }
   #address {
     background: #fff;
     .incomplete {

src/sass/views/wallet-backup-phrase.scss

@@ -26,6 +26,9 @@
           color: rgb(43, 43, 43);
         }
       }
+      .bold-text {
+        font-weight: bold !important;
+      }
       p {
         color: rgb(58, 58, 58);
         font-weight: 200;
@@ -115,7 +118,7 @@
         &,
         & ion-content,
         & ion-content .scroll {
-          overflow-y:visible; 
+          overflow-y:visible;
         }
           #select-phrase {
             float: left;

src/sass/views/walletDetails.scss

@@ -28,6 +28,9 @@
       line-height: 100%;
     }
   }
+  .item.item-footer {
+    font-weight: lighter;
+  }
 }
 
 .wallet-details-release {