fixed header size on narrow desktop window

docs/theme/docker/static/css/main.css

@@ -62,9 +62,12 @@ p a.btn {
   -moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.065);
   box-shadow: 0 1px 4px rgba(0, 0, 0, 0.065);
 }
-.brand.logo a {
+.brand-logo a {
   color: white;
 }
+.brand-logo a img {
+  width: auto;
+}
 .inline-icon {
   margin-bottom: 6px;
 }

docs/theme/docker/static/css/main.less

@@ -125,9 +125,11 @@ p a {
   box-shadow: 0 1px 4px rgba(0, 0, 0, 0.065);
 }
 
-.brand.logo a {
+.brand-logo a {
 	color: white;
-
+  img {
+    width: auto;
+  }
 }
 
 .logo {