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HTML

              
                   <div class='error-wrapper' id='error-wrapper'>
      <div id='error-page'>
         <div id='error-inner'>
            <div class='box-404'>
               <div><span class='zigg'>404</span></div>
            </div>
            <h2>Page Not Found</h2>
            <p>The page you were trying to visit has disappeared or moved to another dimension. Perhaps searching will help.<br/></p>
         </div>
         <div id='search-404'>
            <form action='/search' id='search404'>
               <input name='cof' type='hidden' value='FORID:10'/>
               <input name='ie' type='hidden' value='ISO-8859-1'/>
               <input class='src-form404' name='q' placeholder='Search here...' required='required' type='search'/>
               <button class='src-btn404' title='Search' type='submit'>
                  <svg class='icons icon-Search' viewBox='0 0 24 24'>
                     <path d='M9.5,3A6.5,6.5 0 0,1 16,9.5C16,11.11 15.41,12.59 14.44,13.73L14.71,14H15.5L20.5,19L19,20.5L14,15.5V14.71L13.73,14.44C12.59,15.41 11.11,16 9.5,16A6.5,6.5 0 0,1 3,9.5A6.5,6.5 0 0,1 9.5,3M9.5,5C7,5 5,7 5,9.5C5,12 7,14 9.5,14C12,14 14,12 14,9.5C14,7 12,5 9.5,5Z'/>
                  </svg>
               </button>
            </form>
            <p>
               Or, back to 
               <a expr:href='data:blog.homepageUrl'>
                  homepage 
                  <svg class='icons icon-Forward' viewBox='0 0 24 24'>
                     <path d='M4,11V13H16L10.5,18.5L11.92,19.92L19.84,12L11.92,4.08L10.5,5.5L16,11H4Z'/>
                  </svg>
               </a>
            </p>
         </div>
      </div>
   </div>
              
            
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CSS

              
                @import url('https://fonts.googleapis.com/css2?family=Quicksand:wght@400;700&display=swap');
/* Error 404 */
body{background:#fff;font-family:'Quicksand',sans-serif;line-height:1.4em;overflow:hidden}input[type=search]::-webkit-search-decoration,input[type=search]::-webkit-search-cancel-button,input[type=search]::-webkit-search-results-button,input[type=search]::-webkit-search-results-decoration{-webkit-appearance:none}
@keyframes charge{from{transform:translateY(2rem);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes rotating{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
#error-page{background:#fff;margin:auto;text-align:center;padding:0 10px;width:100%;max-width:1100px;-webkit-box-sizing:border-box;box-sizing:border-box}
#error-inner{margin:12% auto 35px;padding:0;list-style:none!important}
#error-inner .box-404{display:inline-block;position:relative;font-weight:bold;width:200px;height:200px;background:#e84118;color:#fff;font-size:70px;line-height:200px;margin:25px auto}
#error-inner .box-404 .zigg{display:inline-block;position:relative;animation:rotating .6s linear}
#error-inner .box-404::after{content:'';width:0;height:0;position:absolute;top:0;right:0;border-width:30px;border-style:solid;border-color:#fff #fff transparent transparent;display:block}
#error-inner .box-404::before{content:'';width:0;height:0;position:absolute;top:0;left:0;border-width:30px;border-style:solid;border-color:#fff transparent transparent #fff;display:block}
#error-inner .box-404 div::after{content:'';width:0;height:0;position:absolute;bottom:0;left:0;border-width:30px;border-style:solid;border-color:transparent transparent #fff #fff;display:block}
#error-inner .box-404 div::before{content:'';width:0;height:0;position:absolute;bottom:0;right:0;border-width:30px;border-style:solid;border-color:transparent #fff #fff transparent;display:block}
#error-inner h2{color:#2d2d2d;font-weight:700;line-height:1.4em;font-size:30px;animation:charge .5s linear}
#error-inner p{line-height:1.7em;font-size:16px;color:#111;padding:0;margin:15px auto 0 auto;max-width:640px;animation:charge .5s linear}
#search-404{max-width:75%;display:block;margin:0 auto 15%;position:relative}
#search-404 .icons{width:26px;height:26px;fill:#4285f4;vertical-align:middle}
#search-404 .icon-Forward{width:20px;height:20px}
#search-404 p{font-size:90%;color:#999;padding:20px 20px 0;text-align:right}
#search404 input[type=search]{width:100%;border-radius:99em;height:48px;box-shadow:0 1px 6px 0 rgba(32,33,36,0);border:1px solid #dfe1e5;padding:0 48px 0 24px;line-height:48px;font-size:16px;box-sizing:border-box;outline:0;background-color:#fff;transition:all .3s}
#search404 input[type=search]:focus{background:#fff;box-shadow:0 1px 6px 0 rgba(32,33,36,0.28)}
#search404 .src-btn404{background:transparent;border:none;padding:0 20px;outline:none;height:48px;line-height:48px;font-weight:700;margin:0 auto;cursor:pointer;position:absolute;right:0;top:0;z-index:999}
@media screen and (max-width:640px){#error-inner{margin:5% auto 35px}#search-404{max-width:100%}}
              
            
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JS

              
                
              
            
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999px

Console