diff --git a/README.md b/README.md
index 197b43d..4da0920 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,8 @@ ChainKeeper is a web application to explore and analyze block-chain data for use
 
 ### Installation
 
+  - Can be used only in Mac OS and Ubuntu because BlockSci is not supported in Windows
+
 ```sh
 $ cd ChainKeeper
 $ npm install 
diff --git a/chainkeeper_app/src/components/BlockPage.js b/chainkeeper_app/src/components/BlockPage.js
index 2349769..e97b9e9 100644
--- a/chainkeeper_app/src/components/BlockPage.js
+++ b/chainkeeper_app/src/components/BlockPage.js
@@ -21,7 +21,7 @@ class BlockPage extends Component {
 
   componentDidMount() {
        this.setState({ isLoading: true });
-       let openVal = parseInt(this.props.match.params.id);
+       let openVal = parseInt(this.props.match.params.id,10);
 
         fetch("http://192.248.22.171:8080/blocksci/api/v5/block/"+openVal)
               .then(response => response.json())
diff --git a/chainkeeper_app/src/components/LoginwithGoogle.js b/chainkeeper_app/src/components/LoginwithGoogle.js
index c54c37e..5e35267 100644
--- a/chainkeeper_app/src/components/LoginwithGoogle.js
+++ b/chainkeeper_app/src/components/LoginwithGoogle.js
@@ -45,7 +45,7 @@ class LoginwithGoogle extends Component {
         };
         return (
            <div>
-              <img className="google_login" src={require('../public/images/gmail_login.png')} style={{width:"200px"}} onClick={() => imageClick()} />
+              <img className="google_login" alt = "google login"src={require('../public/images/gmail_login.png')} style={{width:"200px"}} onClick={() => imageClick()} />
            </div>
         );
      }
diff --git a/chainkeeper_app/src/components/Navigation.js b/chainkeeper_app/src/components/Navigation.js
index 669b4e8..2e3d512 100644
--- a/chainkeeper_app/src/components/Navigation.js
+++ b/chainkeeper_app/src/components/Navigation.js
@@ -5,9 +5,7 @@ import { withRouter } from 'react-router-dom';
 
 
 class NavigationComp extends Component {
-    constructor(props) {
-        super(props);
-    }
+ 
     getValueFromUser = (event) => {
         if(event) event.preventDefault();
         let path;
@@ -77,7 +75,7 @@ class NavigationComp extends Component {
                             <li className="nav-item dropdown">
                                 <AuthUserContext.Consumer>
                                     {authUser =>
-                                        <a style={{color: "#ffffff"}} className="nav-link dropdown-toggle" href="#"
+                                        <a style={{color: "#ffffff"}} className="nav-link dropdown-toggle" href={null}
                                            id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true"
                                            aria-expanded="false">
                                             <i className="fa fa-user" aria-hidden="true"/> {authUser.email}
diff --git a/chainkeeper_app/src/public/css/main.css b/chainkeeper_app/src/public/css/main.css
index 6836107..644560d 100755
--- a/chainkeeper_app/src/public/css/main.css
+++ b/chainkeeper_app/src/public/css/main.css
@@ -97,7 +97,7 @@ a:hover {
   color: -webkit-linear-gradient(left, #21d4fd, #b721ff);
   color: -o-linear-gradient(left, #21d4fd, #b721ff);
   color: -moz-linear-gradient(left, #21d4fd, #b721ff);
-  color: linear-gradient(left, #21d4fd, #b721ff);
+  color: linear-gradient(to right, #21d4fd, #b721ff);
 }
 
 /*---------------------------------------------*/
@@ -296,7 +296,7 @@ iframe {
   background: -webkit-linear-gradient(left, #21d4fd, #b721ff);
   background: -o-linear-gradient(left, #21d4fd, #b721ff);
   background: -moz-linear-gradient(left, #21d4fd, #b721ff);
-  background: linear-gradient(left, #21d4fd, #b721ff);
+  background: linear-gradient(to right, #21d4fd, #b721ff);
 }
 
 .focus-input100::after {
@@ -363,7 +363,7 @@ iframe {
   color: -webkit-linear-gradient(left, #21d4fd, #b721ff);
   color: -o-linear-gradient(left, #21d4fd, #b721ff);
   color: -moz-linear-gradient(left, #21d4fd, #b721ff);
-  color: linear-gradient(left, #21d4fd, #b721ff);
+  color: linear-gradient(to right, #21d4fd, #b721ff);
 }
 
 .btn-show-pass.active {
@@ -371,7 +371,7 @@ iframe {
   color: -webkit-linear-gradient(left, #21d4fd, #b721ff);
   color: -o-linear-gradient(left, #21d4fd, #b721ff);
   color: -moz-linear-gradient(left, #21d4fd, #b721ff);
-  color: linear-gradient(left, #21d4fd, #b721ff);
+  color: linear-gradient(to right, #21d4fd, #b721ff);
 }
 
 
@@ -408,7 +408,7 @@ iframe {
   background: -webkit-linear-gradient(right, #21d4fd, #b721ff, #21d4fd, #b721ff);
   background: -o-linear-gradient(right, #21d4fd, #b721ff, #21d4fd, #b721ff);
   background: -moz-linear-gradient(right, #21d4fd, #b721ff, #21d4fd, #b721ff);
-  background: linear-gradient(right, #21d4fd, #b721ff, #21d4fd, #b721ff);
+  background: linear-gradient(to left, #21d4fd, #b721ff, #21d4fd, #b721ff);
   top: 0;
   left: -100%;