diff --git a/kit/css/header.css b/kit/css/header.css
index cdf4988..489500a 100644
--- a/kit/css/header.css
+++ b/kit/css/header.css
@@ -18,9 +18,6 @@ header::after {
   left: 0;
   display: block;
   height: 0.33333rem;
-  background-image: -webkit-gradient(linear, left top, left bottom, from(rgba(51, 51, 51, 0.15)), to(rgba(51, 51, 51, 0)));
-  background-image: -webkit-linear-gradient(top, rgba(51, 51, 51, 0.15), rgba(51, 51, 51, 0));
-  background-image: -o-linear-gradient(top, rgba(51, 51, 51, 0.15), rgba(51, 51, 51, 0));
   background-image: linear-gradient(to bottom, rgba(51, 51, 51, 0.15), rgba(51, 51, 51, 0));
 }
 
@@ -30,21 +27,11 @@ header + * {
 }
 
 header .content-wrap {
-  display: -webkit-box;
-  display: -ms-flexbox;
   display: flex;
   height: 100%;
-  -webkit-box-orient: horizontal;
-  -webkit-box-direction: normal;
-  -ms-flex-direction: row;
   flex-direction: row;
-  -ms-flex-wrap: nowrap;
   flex-wrap: nowrap;
-  -webkit-box-align: center;
-  -ms-flex-align: center;
   align-items: center;
-  -webkit-box-pack: start;
-  -ms-flex-pack: start;
   justify-content: flex-start;
 }
 
@@ -115,9 +102,6 @@ header:not(.sticky-header) .header-button-container {
   color: #ffffff;
   font-weight: 500;
   white-space: nowrap;
-  background-image: -webkit-gradient(linear, left bottom, left top, from(#009982), to(#00c8ad));
-  background-image: -webkit-linear-gradient(bottom, #009982, #00c8ad);
-  background-image: -o-linear-gradient(bottom, #009982, #00c8ad);
   background-image: linear-gradient(0deg, #009982, #00c8ad);
   border-radius: 3px;
 }
@@ -139,8 +123,6 @@ header:not(.sticky-header) .header-button-container {
   background-color: #333333;
   border-radius: 3px;
   opacity: 0;
-  -webkit-transition: opacity .5s;
-  -o-transition: opacity .5s;
   transition: opacity .5s;
 }
 
@@ -153,8 +135,6 @@ header:not(.sticky-header) .header-button-container {
   position: absolute;
   top: 10px;
   right: calc((100% - 1170px) / 2);
-  display: -webkit-box;
-  display: -ms-flexbox;
   display: flex;
   padding: 0.61111rem 0;
 }
@@ -171,8 +151,6 @@ header:not(.sticky-header) .header-button-container {
 .header-lang li a {
   padding: 0 8px;
   line-height: 1rem;
-  -webkit-transition: color .3s;
-  -o-transition: color .3s;
   transition: color .3s;
 }
 
@@ -230,8 +208,6 @@ header:not(.sticky-header) .header-button-container {
     padding: 0.66667rem 2.5rem;
   }
   header .header-burger-button + label {
-    -webkit-box-ordinal-group: 11;
-    -ms-flex-order: 10;
     order: 10;
     display: block;
     margin-left: 15px;