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Error Style 1
<!--====== ERROR PART START ======-->
<section class="error-area error-one">
   <div class="container">
      <div class="row justify-content-center">
         <div class="col-xxl-7 col-xl-8 col-lg-8">
            <div class="error-content text-center">
               <span class="error-404">404</span>
               <h5 class="sub-title">Page Not Found</h5>
               <p class="text">
                  There are many variations of passages of Lorem Ipsum avaable, b
                  majority have suffered alteration in some form
               </p>
               <div class="error-form">
                  <form action="#0">
                     <i class="lni lni-search-alt"></i>
                     <input type="text" placeholder="Search for page" />
                     <div class="error-btn rounded-buttons">
                        <button class="btn primary-btn rounded-full">Search</button>
                     </div>
                  </form>
               </div>
            </div>
            <!-- error content -->
         </div>
      </div>
      <!-- row -->
   </div>
   <!-- container -->
</section>
<!--====== ERROR PART ENDS ======-->
/* ===== Buttons Css ===== */
.error-content .primary-btn {
  background: var(--primary);
  color: var(--white);
  box-shadow: var(--shadow-2);
}
.error-content .active.primary-btn, .error-content .primary-btn:hover, .error-content .primary-btn:focus {
  background: var(--primary-dark);
  color: var(--white);
  box-shadow: var(--shadow-4);
}
.error-content .deactive.primary-btn {
  background: var(--gray-4);
  color: var(--dark-3);
  pointer-events: none;
}

/*===== ERROR ONE Style =====*/
.error-content {
  padding-top: 120px;
  padding-bottom: 120px;
}
.error-content .error-404 {
  font-size: 98px;
  font-weight: 600;
  color: var(--black);
  line-height: 90px;
}
.error-content .sub-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--black);
  margin-top: 16px;
}
.error-content .text {
  font-size: 16px;
  line-height: 24px;
  color: var(--dark-3);
  margin-top: 8px;
}
.error-content .error-form {
  max-width: 410px;
  position: relative;
  margin: 0 auto;
  margin-top: 40px;
  position: relative;
}
.error-content .error-form i {
  position: absolute;
  top: 12px;
  left: 20px;
  font-size: 24px;
  color: var(--primary);
}
.error-content .error-form input {
  width: 100%;
  height: 46px;
  padding-left: 60px;
  padding-right: 30px;
  border-radius: 50px;
  border: 2px solid var(--gray-4);
  font-size: 16px;
  font-weight: 600;
  color: var(--dark-3);
}
.error-content .error-form input:focus {
  border-color: var(--primary);
}
.error-content .error-btn {
  position: absolute;
  top: 0;
  right: 0;
}
@media (max-width: 767px) {
  .error-content .error-btn {
    position: relative;
    width: 100%;
    margin-top: 8px;
  }
}
@media (max-width: 767px) {
  .error-content .primary-btn {
    width: 100%;
  }
}
Error Style 2
Error Style 3
Error Style 4