Customize Blogger 404 page

Importance To 404 Page:

404 page is really important in blogs because if your user finds an invalid link he/she may think that your blog is full of expired links but if you have custom page then he/she may think its just a typographic mistake and start reading your other posts.

Creating A 404 Error Page In Blogger:  

Goto blogger dashboard

Then goto setting tab and click on search preferences 

then click custom page not found edit button.

Then paste below codes in it.

<style type="text/css" > body {background:white url('https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgeOxsVEosgz5uHypxclWjrDPD8i3gHJCbVVBFR7B9vr3LSxqOg7py9TVfjCF_3PMYrEAcNyIvd7spsdO9eJQ8yXpP_V0OmeHyQ75aiUAhQ_ETdjFqF_AOhAFA7b3ZZzR8CBkb2b_iD4Ww/s1600/404-not-found-page-24.jpg') 50% 0% no-repeat !important;z-index:10000000;} .sidebar, footer, .content, .header, .columns-inner, .footer-top {display:none;} body {min-width: 0px !important;} </style>

<style type="text/css" >

body {background:white url('https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiGtfdWltw_0yVGSaO68jJNnLlTsuhlQ5oKP_GqMfQofC4Lh3pZOkc9X4JsPzmFmzZEiSpECoeBudnQEfg9BHXpJU9wE0n6WPJIMyOVT3ut_0uJ_ymQ33vU8VFOE704IlIFgE9rMMrnm6Y/s640/404_6.jpg')  50% 0% no-repeat !important;z-index:10000000;}

.sidebar, footer, .content, .header, .columns-inner, .footer-top {display:none;}

body {min-width: 0px !important;}

</style>

Now save it and its done