fix: tiny CSS fix (#21)

* fix: tiny CSS fix

* fix: fix hover

Author: JTorreG

assets/css/f5-hugo.css

@@ -13,6 +13,7 @@
     border-color: #272822;
     border: 1px solid;
     border-radius: 4px 4px 0px 0px;
+    border-bottom: 0px;
     display: block;
     margin-left: auto;
     margin-right: 0;
@@ -27,6 +28,7 @@
     color: #ffffff;
     border-color: #272822!important;
     border: 1px solid;
+    border-bottom: 0px;
 }
 
 .code-copy:focus {