.code-macro__language {
  display: none;
}

<style>
   /*    Copy the following code to "Custom CSS"*/
   .error-page {
       padding-top: 5rem
   }
   a {
       text-decoration: none
   }
   a:hover {
       text-decoration: none
   }
   #content > h1:nth-child(1) {
        font-size: 0
    }
   h1 {
       margin-bottom: 3rem
   }
   [i18nkey="page.error.status.404.label"] {
       visibility: hidden;
       font-size: 0
   }

   /*    Update the title in "content"*/
   [i18nkey="page.error.status.404.label"]:before {
       visibility: visible;
       text-align:left;
       color: #1381D7;
       content: 'Delphix Continuous Data documentation has a new home.';
       font-size: xx-large
   }


   [i18nkey="page.error.heading.label"]  {
       visibility: hidden;
       font-size: 0
   }

   /*    Update the description in "content"*/
   [i18nkey="page.error.heading.label"]:before {
       visibility: visible;
       text-align:left;
       font-size: large;
       content: 'Delphix product documentation is on a new platform to better serve our growing portfolio. Please note the new home page and update your bookmarks. We apologize for any inconvenience.';
   }
   [i18nkey="page.error.homepage.label"] {
       background-color: #04bf20;
       color: white;
       border: 1px solid #04bf20;
       text-decoration: none;
       border-radius: 21px;
       font-size: large;
       font-weight: 600;
       line-height: 1;
       transition: .2s;
       padding:12px 25px;
   }
   [i18nkey="page.error.homepage.label"]:hover {
       background-color: #029619;
       text-decoration:none
   }
   .error--search {
       display: none
   }
</style>