Update stryles

Author: ElinorW

src/app/utils/searchbox.styles.ts

@@ -1,6 +1,6 @@
 export const searchBoxStyles: any = () => ({
   root: {
-    width: '97%'
+    width: '100%'
   },
   field: [
     {

src/app/views/sidebar/resource-explorer/ResourceExplorer.tsx

@@ -154,7 +154,7 @@ const UnstyledResourceExplorer = (props: any) => {
         <Stack horizontal reversed verticalAlign="center" tokens={{ childrenGap: 8 }}>
           <Stack.Item align='auto'>
             <div style={styles.apiCollectionCount}>
-              {selectedLinks.length > 0 ? `(${selectedLinks.length})` : '(0)'}
+              {selectedLinks.length > 0 ? `(${selectedLinks.length})` : ''}
             </div>
           </Stack.Item>
         </Stack>

src/app/views/sidebar/resource-explorer/resources.styles.ts

@@ -34,7 +34,7 @@ export const resourceExplorerStyles = (theme: ITheme) => {
         display: 'flex',
         alignItems: 'center',
         justifyContent: 'flex-start',
-        backgroundColor: theme.palette.neutralLighterAlt,
+        backgroundColor: theme.palette.white,
         textAlign: 'left',
         height: '40px',
         marginTop: '10px'