fix: make active tab more clear

Author: RomanHotsiy

src/common-elements/tabs.ts

@@ -16,12 +16,16 @@ export const Tabs = styled(ReactTabs)`
       display: inline-block;
       flex: 1;
       background-color: rgba(0, 0, 0, 0.2);
+      border-bottom: 1px solid rgba(0, 0, 0, 0.5);
       cursor: pointer;
       text-align: center;
       outline: none;
+      color: #ccc;
 
       &.react-tabs__tab--selected {
-        background-color: #171e21;
+        color: #fff;
+        background: rgba(0, 0, 0, 0.5);
+        border-bottom: 1px solid ${props => props.theme.schemaView.linesColor};
       }
 
       &:only-child {