Card Details, fix card header while scrolling

client/components/cards/cardDetails.styl

@@ -110,6 +110,8 @@ avatar-radius = 50%
     padding: 7px 20px
     background: darken(white, 7%)
     border-bottom: 1px solid darken(white, 14%)
+    position: sticky
+    top: 0px
 
     .card-number {
       color: darken(white, 30%);