Change logo and header-nav css.

assets/stylesheets/template/layout/header.scss

@@ -1,4 +1,4 @@
-@charset "utf-8";
+@charset "utf-8";
 
 @import "../initial";
 
@@ -37,7 +37,7 @@
       text-align: right;
     }
     @media (max-width:767px){
-      display: none;
+      float: left;
     }
   }
 
@@ -64,9 +64,14 @@
       @media (max-width: 767px) {
         height: 5em;
       }
+      @media (max-width: 633px) {
+        width: 100%;
+        margin: 0;
+        height: unset;
+      }
 
       @media (max-width: 480px) {
-        height: 3.5em;
+        height: unset;
         padding: 0 0.5rem;
         margin: 0;
       }