NavbarToggler color 변경

@@ -16,13 +16,15 @@ const NavBar = (props) => {
 
   return (
     <>
-      <Navbar style={{'backgroundColor': '#940f0f', 'display':'block'}} light expand="md" fixed="top">
+      <Navbar dark style={{'backgroundColor': '#940f0f', 'display':'block'}} light expand="md" fixed="top">
       <Container className="themed-container">
         <span>
             <a href='/'><img src="logo.png" alt="logo" width="50" /></a>
         </span>
         <NavbarBrand href="/" style={{'marginLeft':'1.5rem', 'color':'#fff'}}>MEALKHU</NavbarBrand>
-        <NavbarToggler onClick={toggle} />
+        <NavbarToggler style={{
+          
+        }} onClick={toggle} />
           <Collapse isOpen={isOpen} navbar>
             <Nav className="mr-auto" navbar>
               <NavItem>

@@ -64,7 +64,7 @@ app.post("/api/signup", (req, res) => {
 
   let sql_usercheck = `SELECT * FROM USER WHERE name='${req.body.username}';`;
   connection.query(sql_usercheck, (err, rows, fields) => {
-    if(rows.length!==0) {
+    if(rows.length) {
       return res.json({
         code: 400,
         message: 'user exist'
@@ -100,7 +100,7 @@ app.post("/api/signin", (req, res) => {
   let sql_usercheck = `SELECT * FROM USER WHERE name='${req.body.username}';`;
  
   connection.query(sql_usercheck, (err, rows, fields) => {
-    if(rows.length === 0) {
+    if(!rows.length) {
       return res.send({
         code: 400,
         message: "user does not exist",