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HTML

              
                <div class="search-overlay"></div>
<div class="scroll-cont">
  <div class="content">
    <div class="search">
      <div class="search__bg"></div>
      <div class="search__box">
        <input type="text" class="search__input" placeholder="Search"/>
        <div class="search__line"></div>
        <div class="search__close"></div>
      </div>
    </div>
    <p class="desc">This search input should work with any position/layout type, including normal pages with scroll. Just don't override .s--cloned styles for .search and everything will be okay. Requires specific styles for containers (check html+body and .scroll-cont styles) and .search-overlay element to be placed in the root.</p>
  </div>
</div>
              
            
!

CSS

              
                *, *:before, *:after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

.search-overlay {
  z-index: -1000;
  overflow: hidden;
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;

  &.s--active {
    z-index: 9999;
  }
}

.scroll-cont {
  position: relative;
  height: 100%;
  overflow-y: auto;
}

.content {
  padding: 50px;
}

.desc {
  max-width: 900px;
  margin: 0 auto;
  font-size: 25px;
}

$contSize: 116px;
$boxInitSize: 50px;
$boxActiveW: 510px;
$boxActiveH: 100px;
$borderW: 4px;

$inputH: 50px;
$inputVertPad: ($boxActiveH - $inputH - $borderW) / 2;
$inputLeftPad: 40px;
$inputRightPad: 90px;

$closeSize: 30px;
$closeRight: 44px;
$closeTop: ($boxActiveH - $closeSize - $borderW) / 2;

$maxWidth: 3840px;
$bgScaleRatio: $maxWidth / $contSize * 1.45;

$searchAT: 0.6s;
$moveAT: 0.4s;
$easing: ease;

.search {
  position: relative;
  margin: 0 auto 50px;
  width: $contSize;
  height: $contSize;
  perspective: 1000px;

  &:not(.s--active) {
    cursor: pointer;
  }

  &.s--hidden {
    opacity: 0;
  }

  &.s--cloned {
    position: absolute;
    left: 50%;
    top: 50%;
    right: auto;
    bottom: auto;
    margin-left: $contSize/-2;
    margin-top: $contSize/-2;
    margin-right: 0;
    margin-bottom: 0;
  }
  
  &.s--moving {
    transition: transform $moveAT cubic-bezier(.56,-0.49,.58,.9);
  }

  &__bg {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: #F63;
    transition: all $searchAT $easing;
    transform: translate3d(-50%,-50%,0);
    will-change: transform;

    .search.s--active & {
      transform: translate3d(-50%,-50%,0) scale($bgScaleRatio);
    }
  }

  &__box {
    position: absolute;
    left: 50%;
    top: 50%;
    width: $boxInitSize;
    height: $boxInitSize;
    border: $borderW solid #fff;
    border-radius: $boxInitSize/2;
    transform: translate(-50%, -50%);
    transition: all $searchAT*0.75 $easing;

    .search.s--active & {
      width: $boxActiveW;
      height: $boxActiveH;
      border-radius: $boxActiveH/2;
    }
  }

  &__input {
    width: 100%;
    height: 100%;
    background: transparent;
    border: none;
    outline: none;
    pointer-events: none;
    opacity: 0;
    color: #fff;
    font-size: 40px;
    transition: opacity 0s;

    &::placeholder {
      color: rgba(255,255,255,0.4);
    }

    .search.s--active & {
      padding: $inputVertPad $inputRightPad $inputVertPad $inputLeftPad;
      pointer-events: auto;
      opacity: 1;
      transition: opacity $searchAT*0.3 $searchAT*0.8;
    }
  }

  &__line {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 20px;
    height: 4px;
    border-radius: 2px;
    background: #fff;
    transform-origin: 0 50%;
    transform: translate(14px, 14px) rotate(45deg);
    transition: all $searchAT*0.8;

    &:before {
      content: "";
      position: absolute;
      left: 0;
      bottom: 0;
      width: inherit;
      height: inherit;
      background: inherit;
      border-radius: inherit;
      transform: rotate(90deg);
      opacity: 0;
      transition: opacity $searchAT/2;

      .search.s--active & {
        opacity: 1;
        transition: opacity $searchAT/2 $searchAT*0.7;
      }
    }

    .search.s--active & {
      width: 36px;
      height: 6px;
      transform: translate($boxActiveW/2 - 75px, 11px) rotate(-45deg);
    }
  }

  &__close {
    position: absolute;
    right: 0;
    top: 0;
    width: $closeSize;
    height: $closeSize;
    pointer-events: none;

    .search.s--active & {
      right: $closeRight;
      top: $closeTop;
      pointer-events: auto;
      cursor: pointer;
    }
  }
}


              
            
!

JS

              
                (function() {
  var $searchOverlay = document.querySelector(".search-overlay");
  var $search = document.querySelector(".search");
  var $clone, offsetX, offsetY;

  $search.addEventListener("click", function() {
    var $original = this;
    $clone = this.cloneNode(true);

    $searchOverlay.classList.add("s--active");

    $clone.classList.add("s--cloned", "s--hidden");
    $searchOverlay.appendChild($clone);

    var triggerLayout = $searchOverlay.offsetTop;

    var originalRect = $original.getBoundingClientRect();
    var cloneRect = $clone.getBoundingClientRect();

    offsetX = originalRect.left - cloneRect.left;
    offsetY = originalRect.top - cloneRect.top;

    $clone.style.transform = "translate("+ offsetX +"px, "+ offsetY +"px)";
    $original.classList.add("s--hidden");
    $clone.classList.remove("s--hidden");

    var triggerLayout = $searchOverlay.offsetTop;

    $clone.classList.add("s--moving");

    $clone.setAttribute("style", "");

    $clone.addEventListener("transitionend", openAfterMove);
  });

  function openAfterMove() {
    $clone.classList.add("s--active");
    $clone.querySelector("input").focus();

    addCloseHandler($clone);
    $clone.removeEventListener("transitionend", openAfterMove);
  };
  
  function addCloseHandler($parent) {
    var $closeBtn = $parent.querySelector(".search__close");
    $closeBtn.addEventListener("click", closeHandler);
  };

  /* close handler functions */
  function closeHandler(e) {
    $clone.classList.remove("s--active");
    e.stopPropagation();
    
    var $cloneBg = $clone.querySelector(".search__bg");

    $cloneBg.addEventListener("transitionend", moveAfterClose);
  };
  
  function moveAfterClose(e) {
    e.stopPropagation(); // prevents from double transitionend even fire on parent $clone
    
    $clone.classList.add("s--moving");
    $clone.style.transform = "translate("+ offsetX +"px, "+ offsetY +"px)";
    $clone.addEventListener("transitionend", terminateSearch);
  };
  
  function terminateSearch(e) {
    $search.classList.remove("s--hidden");
    $clone.remove();
    $searchOverlay.classList.remove("s--active");
  };
}());
              
            
!
999px

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