Added width for inputs fields in form-control class.

Purpose of adding the fix width is to sync SSO buttons and
inputs fields widths for the screen 600 and above.

VAN-353

src/_style.scss

@@ -56,6 +56,10 @@ $apple-focus-black: $apple-black;
   box-sizing: content-box;
 }
 
+.form-control {
+  width: 500px;
+}
+
 .btn-social {
   display: flex;
   flex-direction: row;
@@ -306,6 +310,9 @@ $apple-focus-black: $apple-black;
   .tpa-container {
     justify-content: center;
   }
+  .form-control {
+    width: 100%;
+  }
 }
 
 @media (max-width: 450px) {