diff --git a/style.css b/style.css
index c91d052..2164c02 100644
--- a/style.css
+++ b/style.css
@@ -179,8 +179,11 @@ header {
   position: relative;
   padding: 2px 0;
 
+  -ms-flex-wrap: wrap;
   flex-wrap: wrap;
   width: calc(100% / 5);
+  -webkit-box-flex: 1;
+  -ms-flex-positive: 1;
   flex-grow: 1;
 
   text-align: center;
@@ -226,6 +229,7 @@ header {
   display: -webkit-box;
   display: -ms-flexbox;
   display: flex;
+  -ms-flex-wrap: wrap;
   flex-wrap: wrap;
 
   -webkit-box-orient: horizontal;
@@ -274,7 +278,10 @@ header {
   #navigation ul li {
     min-width: 91px;
     margin: 10px auto;
+    -webkit-box-flex: 1;
+    -ms-flex-positive: 1;
     flex-grow: 1;
+    -ms-flex-wrap: wrap;
     flex-wrap: wrap;
   }
   #header-img-group-banner img {