
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="http://4.bp.blogspot.com/-3_mjW7aMWMo/T22zQQHn-sI/AAAAAAAAAMQ/f-biNvAo1-Y/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="http://4.bp.blogspot.com/-3_mjW7aMWMo/T22zQQHn-sI/AAAAAAAAAMQ/f-biNvAo1-Y/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="http://2.bp.blogspot.com/-oGC6zPGYpDk/T22zRTPEHkI/AAAAAAAAAMY/_QDDN_HW40A/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="http://2.bp.blogspot.com/-oGC6zPGYpDk/T22zRTPEHkI/AAAAAAAAAMY/_QDDN_HW40A/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="http://2.bp.blogspot.com/-ldrwg_L3hPw/T29ZifhYlUI/AAAAAAAAAMo/wdhPPVcNEDM/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="http://2.bp.blogspot.com/-ldrwg_L3hPw/T29ZifhYlUI/AAAAAAAAAMo/wdhPPVcNEDM/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="http://4.bp.blogspot.com/-gdd8Nj5zNqg/T29ZjfvDjYI/AAAAAAAAAMw/vwwjnuqR1Ro/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="http://4.bp.blogspot.com/-gdd8Nj5zNqg/T29ZjfvDjYI/AAAAAAAAAMw/vwwjnuqR1Ro/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="http://3.bp.blogspot.com/-VazK8ZIMIo0/T29ZktlwCVI/AAAAAAAAAM4/Fb4VUpCh2LY/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="http://3.bp.blogspot.com/-VazK8ZIMIo0/T29ZktlwCVI/AAAAAAAAAM4/Fb4VUpCh2LY/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="http://3.bp.blogspot.com/-unUiQAZJDZM/T29ZhgrSbnI/AAAAAAAAAMg/7KLym2snYbI/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="http://3.bp.blogspot.com/-unUiQAZJDZM/T29ZhgrSbnI/AAAAAAAAAMg/7KLym2snYbI/s1600/404+error+page+3.jpg"/>
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