diff --git a/src/components/common/category/category.module.scss b/src/components/common/category/category.module.scss
index c6e7d41..17c0e1a 100644
--- a/src/components/common/category/category.module.scss
+++ b/src/components/common/category/category.module.scss
@@ -6,7 +6,7 @@
   border: tovw(1px, 'default', 1px) solid var(--color-white);
   border-radius: tovw(4px, 'default', 4px);
   padding: 0 tovw(8px, 'default', 8px);
-  max-width: fit-content;
+  width: fit-content;
   height: tovw(32px, 'default', 32px);
   text-transform: uppercase;
   line-height: tovw(16px, 'default', 16px);
diff --git a/src/components/common/header/header.module.scss b/src/components/common/header/header.module.scss
index 0378424..28acfe2 100644
--- a/src/components/common/header/header.module.scss
+++ b/src/components/common/header/header.module.scss
@@ -11,6 +11,10 @@
   width: 100%;
   backdrop-filter: blur(20px);
 
+  @-moz-document url-prefix("") {
+    background-color: var(--color-black);
+  }
+
   nav {
     display: flex;
     align-items: center;