add body, a tag global style

@@ -9,14 +9,26 @@ export default createGlobalStyle`
     }
     }
     body {
     body {
         max-width: 100%;
         max-width: 100%;
+        min-height: 100vh;
+        overflow-x: hidden;
+        display:flex;
+        flex-direction:column;
     }
     }
     li {
     li {
         list-style: none;
         list-style: none;
     }
     }
     a {
     a {
+        color: black;
         text-decoration:none;
         text-decoration:none;
     }
     }
     input:focus {
     input:focus {
         outline:none;
         outline:none;
     }
     }
+    #root {
+        max-width: 100%;
+        min-height: 100vh;
+        overflow-x: hidden;
+        display:flex;
+        flex-direction:column;    
+    }
 `;
 `;