
menampilkan pesan Error halaman dalam kotak
If you want to show only a custom message then First Go to updated Blogger Interface
Then Go to Setting->Search Preferences

If you want Colorful Stylish 404 page do the following.
- Go to Design->Edit HTML
- Find </head> and copy the below code just above it.
<b:if cond='data:blog.pageType == "error_page"'>
<style type="text/css">.status-msg-wrap{font-size:100%;margin:none;position:static;width:100%}.status-msg-border{display:none}.status-msg-body{padding:none;position:static;text-align:inherit;width:100%;z-index:auto}.status-msg-wrap a{padding:none;text-decoration:inherit}</style>
</b:if>
<style type="text/css">.status-msg-wrap{font-size:100%;margin:none;position:static;width:100%}.status-msg-border{display:none}.status-msg-body{padding:none;position:static;text-align:inherit;width:100%;z-index:auto}.status-msg-wrap a{padding:none;text-decoration:inherit}</style>
</b:if>
- Save the Template

- Go to Setting->Search Preferences
- Copy below code in Custom Page Not Found section [as shown in fig. first]
<h2 style="font-size: 35px;margin: 0;text-align: center;">Oops..! </h2>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDcp0Kq5oZmWo9AIESCUbIlMi5acbrrVtE6WtpUyUMazXa3ibWl5pFAGtNFNfytc52sj_OX2ex_rFUh1IiseEbUz1BsLj8qC43EovlephDwdKMwSlQ7nZNAczaIrzJD746HIF079XhL2Q/s1600/404+error+page+1.jpg"/>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDcp0Kq5oZmWo9AIESCUbIlMi5acbrrVtE6WtpUyUMazXa3ibWl5pFAGtNFNfytc52sj_OX2ex_rFUh1IiseEbUz1BsLj8qC43EovlephDwdKMwSlQ7nZNAczaIrzJD746HIF079XhL2Q/s1600/404+error+page+1.jpg"/>

- Go to Setting->Search Preferences
- Copy below code in Custom Page Not Found section [as shown in fig. first]
<h2 style="font-size: 35px;margin: 0;text-align: center;">Oops..! </h2>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcr_zJOwS1nqQY6vSe8dJdvnCrixGT_avh-jvQR5IYlFkUg8JvHJGyvxEsYUPmefWvRPKMFzij7A5Z0CFZylmiel3luR0TwYgQY3J-SWa9HquurlO60XkQZQ-cbVGZLgVrDm_pXyjOArU/s1600/404+error+page+2.jpg"/>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcr_zJOwS1nqQY6vSe8dJdvnCrixGT_avh-jvQR5IYlFkUg8JvHJGyvxEsYUPmefWvRPKMFzij7A5Z0CFZylmiel3luR0TwYgQY3J-SWa9HquurlO60XkQZQ-cbVGZLgVrDm_pXyjOArU/s1600/404+error+page+2.jpg"/>

- Go to Setting->Search Preferences
- Copy below code in Custom Page Not Found section [as shown in fig. first]
<h2 style="font-size: 35px;margin: 0;text-align: center;">Oops..! </h2>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnx82Y-p13tuzNChybwGMEF5jLcouheXHFS5JvN6m_vnu4u6C6KqMmvA15Dcp29lEQqSllv9_-zh4_rUgLX5zc8hKOxlpkRHVC9CYQv8j4HK09wFbJ6AxvShY3ZvYsmMT_UDu_gQttit0/s1600/404+error+page+4.jpg"/>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnx82Y-p13tuzNChybwGMEF5jLcouheXHFS5JvN6m_vnu4u6C6KqMmvA15Dcp29lEQqSllv9_-zh4_rUgLX5zc8hKOxlpkRHVC9CYQv8j4HK09wFbJ6AxvShY3ZvYsmMT_UDu_gQttit0/s1600/404+error+page+4.jpg"/>

- Go to Setting->Search Preferences
- Copy below code in Custom Page Not Found section [as shown in fig. first]
<h2 style="font-size: 35px;margin: 0;text-align: center;">Oops..! </h2>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0T1iNtg6Ac8CnmUMhpUzkxrJOXxgU30cEo90YlkAPkjzbdo51u-ZwInaDYJa7Q2qJQgr50hJjmR51n8h1UOq0HuND7nCWESmm85-MhXzRx9kHFfEeKE9gRiM4dF0JHeRHuBu4FA1xDyE/s320/404+error+page+6.jpg"/>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0T1iNtg6Ac8CnmUMhpUzkxrJOXxgU30cEo90YlkAPkjzbdo51u-ZwInaDYJa7Q2qJQgr50hJjmR51n8h1UOq0HuND7nCWESmm85-MhXzRx9kHFfEeKE9gRiM4dF0JHeRHuBu4FA1xDyE/s320/404+error+page+6.jpg"/>

- Go to Setting->Search Preferences
- Copy below code in Custom Page Not Found section [as shown in fig. first]
<h2 style="font-size: 35px;margin: 0;text-align: center;">Oops..! </h2>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaWJrnbRTyI-XQKlNcSGKVeqZku279n6pulgbd3PLOWcMGx788WKichC4W3cTZ-28I9f1k57uWZ9yqtbgq74TfiVOsnzsC6lGJ5u8Z-XjnZItx8cQpReSN29VrkTRtTp29ED6zUg48ptA/s1600/404+error+page+7.jpg"/>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaWJrnbRTyI-XQKlNcSGKVeqZku279n6pulgbd3PLOWcMGx788WKichC4W3cTZ-28I9f1k57uWZ9yqtbgq74TfiVOsnzsC6lGJ5u8Z-XjnZItx8cQpReSN29VrkTRtTp29ED6zUg48ptA/s1600/404+error+page+7.jpg"/>

- Go to Setting->Search Preferences
- Copy below code in Custom Page Not Found section [as shown in fig. first]
<h2 style="font-size: 35px;margin: 0;text-align: center;">Oops..! </h2>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhMYpD2U-ubkY88bfHDlAwt6FamhgdF1wDuLTMrVHZ_njv1h77r9YYk3kML758mQQUvOv3Qyoz8RwT-9AHdodCG7Cc-lnlVZZVrCk1bCvNaBzhTDoIky17qJZR1SQSzVd28_BW2bsN7st4/s1600/404+error+page+3.jpg"/>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhMYpD2U-ubkY88bfHDlAwt6FamhgdF1wDuLTMrVHZ_njv1h77r9YYk3kML758mQQUvOv3Qyoz8RwT-9AHdodCG7Cc-lnlVZZVrCk1bCvNaBzhTDoIky17qJZR1SQSzVd28_BW2bsN7st4/s1600/404+error+page+3.jpg"/>
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