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HTML 

              
                <h1>CSS Animated Search Boxes</h1>
<p>(with occasional help from javascript to assign focus)</p>
<p>buttons don't actually function.  all animations are triggered on the focus state of the input.</p>

<p class="sample">JUST A SEARCH BUTTON...</p>
<p class="sample">...WITH A RESET BUTTON</p>
<div class="sample one">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search fa fa-search"></button>
</div>

<div class="sample two">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search fa fa-search"></button>
  <button type="reset" class="btn btn-reset fa fa-times"></button>
</div>

<div class="sample three">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search">
    <i class="fa fa-search fa-flip-horizontal"></i>
  </button>
</div>

<div class="sample four">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search">
    <i class="fa fa-search fa-flip-horizontal"></i>
  </button>
  <button type="reset" class="btn btn-reset fa fa-times"></button>
</div>

<div class="sample five">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search">
    <i class="fa fa-search fa-flip-horizontal"></i>
  </button>
</div>

<div class="sample six">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search">
    <i class="fa fa-search fa-flip-horizontal"></i>
  </button>
  <button type="reset" class="btn btn-reset fa fa-times"></button>
</div>

<div class="sample seven">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search">
    <i class="fa fa-search"></i>
  </button>
</div>

<div class="sample eight">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search">
    <i class="fa fa-search"></i>
  </button>
  <button type="reset" class="btn btn-reset fa fa-times"></button>
</div>

<div class="sample nine">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search">
    <i class="fa fa-search"></i>
  </button>
</div>

<div class="sample ten">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search">
    <i class="fa fa-search"></i>
  </button>
  <button type="reset" class="btn btn-reset fa fa-times"></button>
</div>

<div class="sample eleven">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search">
    <i class="fa fa-search"></i>
  </button>
</div>

<div class="sample twelve">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search">
    <i class="fa fa-search"></i>
  </button>
  <button type="reset" class="btn btn-reset fa fa-times"></button>
</div>

<div class="sample thirteen">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search">
    <i class="fa fa-search"></i>
  </button>
</div>

<div class="sample fourteen">
  <input type="text" name="search" placeholder="search">
  <button type="submit" class="btn btn-search">
    <i class="fa fa-search"></i>
  </button>
  <button type="reset" form="form" class="btn btn-reset fa fa-times"></button>
</div>
!

CSS 

              
                @import "compass/css3";

* {
  box-sizing: border-box;
}
html,
body {
  font-size: 12px;
}
h1 {
  margin: 10px 0 0;
  text-align: center;
}
p {
  margin: 0 0 20px;
  text-align: center;
}
input {
  border: 1px solid #ccc;
  font-size: 12px;
  height: 30px;
  padding: 4px 8px;
  position: absolute;
  width: 50%;
  &:focus {
    outline: none;
  }
}
button {
  text-align: center;
  &:focus {
    outline: none;
  }
  &.btn-search,
  &.btn-reset {
    background: hotpink;
    border: none;
    height: 30px;
    font-size: 12px;
    padding: 4px;
    position: absolute;
    width: 30px;
  }
}

.sample {
  float: left;
  height: 50px;
  margin: 0 8%;
  position: relative;
  width: 34%;
  &.one,
  &.two {
    input {
      border-radius: 15px;
      right: 0;
      transition: all .3s ease-in-out;
      width: 50%;
      &:focus {
        width: 100%;
        ~ button {
          &.btn-search {
            background: hotpink;
            color: #fff;
          }
          &.btn-reset {
            right: -22px;
          }
        }
      }
    }
    button {
      transition: all .3s ease-in-out;
      &.btn-search {
        background: #ccc;
        border-radius: 50%;
        height: 26px;
        right: 2px;
        top: 2px;
        transition: all .3s ease-in-out;
        width: 26px;
      }
      &.btn-reset {
        background: #fff;
        border: 1px solid #ccc;
        border-radius: 50%;
        font-size: 10px;
        height: 20px;
        line-height: 20px;
        padding: 0;
        right: 5px;
        top: 5px;
        width: 20px;
        z-index: -1;
      }
    }
  }
  &.three,
  &.four {
    perspective: 400px;
    input {
      width: 120px;
      &:focus {
        ~ button {
          &.btn-search {
            transform: rotateY(180deg);
            transition: transform .6s ease-in-out .2s;
          }
          &.btn-reset {
            transform: rotateX(0deg) translateY(32px) translateX(2px);
            transition: transform .6s ease-in-out .8s;
          }
        }
      }
    }
    button {
      &.btn-search {
        backface-visibility: visible;
        color: #fff;
        padding: 0;
        position: relative;
        transform: rotateY(0deg);
        transform-origin: 121px 0;
        transform-style: preserve3d;
        transition: transform .6s ease-in-out .2s;
        width: 120px;
      }
      &.btn-reset {
        backface-visibility: hidden;
        background: #ccc;
        transform: rotateX(-180deg) translateY(30px) translateX(2px);
        transform-origin: 0 32px;
        transform-style: preserve3d;
        transition: transform .6s ease-in-out .2s;
        width: 120px;
      }
    }
  }
  &.four {
    button {
      &.btn-search {
        transition: transform .6s ease-in-out .8s;
      }
    }
  }
  &.five,
  &.six {
    perspective: 400px;
    input {
      width: 120px;
      &:focus {
        ~ button {
          &.btn-search {
            transform: rotateY(180deg) translateX(60px);
            transition: all .6s ease-in-out .2s;
            width: 60px;
          }
          &.btn-reset {
            transform: rotateY(0deg);
            transition: all .6s ease-in-out .8s;
          }
        }
      }
    }
    button {
      &.btn-search {
        backface-visibility: visible;
        color: #fff;
        padding: 0;
        position: relative;
        transform: rotateY(0deg) translateX(0px);
        transform-origin: 121px 0;
        transform-style: preserve3d;
        transition: all .6s ease-in-out .2s;
        width: 120px;
      }
      &.btn-reset {
        backface-visibility: hidden;
        background: #ccc;
        left: 184px;
        transform: rotateY(180deg);
        transform-origin: left 0;
        transform-style: preserve3d;
        transition: all .6s ease-in-out .2s;
        width: 60px;
      }
    }
  }
  &.six {
    button {
      &.btn-search {
        transition: all .6s ease-in-out .8s;
      }
    }
  }
  &.seven,
  &.eight {
    input {
      border-right: none;
      transition: all .3s ease-in;
      width: 120px;
      &:focus {
        width: 220px;
        ~ button {
          &.btn-search {
            background: hotpink;
            border-radius: 0 50% 50% 0;
            color: #fff;
            left: 220px;
          }
          &.btn-reset {
            animation: bounceRight .6s;
            animation-delay: .2s;
            animation-timing-function: cubic-bezier(.3,.2,1,.8);
            border-radius: 50%;
            color: #fff;
            left: 254px;
          }
        }
      }
    }
    button {
      &.btn-search {
        background: #ccc;
        left: 120px;
        transition: all .3s ease-in;
      }
      &.btn-reset {
        background: #000;
        height: 20px;
        left: 120px;
        top: 5px;
        transition: all .3s ease-in;
        width: 20px;
        z-index: -1;
      }
    }
  }
  &.nine,
  &.ten {
    input {
      border-radius: 15px;
      transition: all .6s ease-in-out .3s;
      width: 120px;
      &:focus {
        transition-delay: 0;
        width: 200px;
        ~ button {
          transform: rotateZ(360deg);
          &.btn-search {
            background: hotpink;
            color: #fff;
            left: 172px;
            transition-delay: 0;
          }
          &.btn-reset {
            left: 202px;
            transition-delay: .3s;
          }
        }
      }
    }
    button {
      transition: all .6s ease-in-out;
      &.btn-search {
        background: #ccc;
        border-radius: 50%;
        height: 26px;
        left: 92px;
        top: 2px;
        transition-delay: .3s;
        width: 26px;
      }
      &.btn-reset {
        background: #fff;
        border: 1px solid #ccc;
        border-radius: 50%;
        font-size: 10px;
        height: 20px;
        left: 92px;
        line-height: 20px;
        padding: 0;
        top: 5px;
        width: 20px;
        z-index: -1;
      }
    }
  }
  &.eleven,
  &.twelve {
    input {
      border-radius: 15px;
      transition: all .6s ease-in-out;
      width: 120px;
      &:focus {
        width: 200px;
        ~ button {
          &.btn-search {
            animation: jumpTowardSearch 1.2s linear;
            background: hotpink;
            color: #fff;
            left: 172px;
          }
          &.btn-reset {
            animation: jumpTowardReset 1.2s linear .4s;
            left: 202px;
          }
        }
      }
    }
    button {
      transition: all .6s ease-in-out;
      &.btn-search {
        background: #ccc;
        border-radius: 50%;
        height: 26px;
        left: 92px;
        top: 2px;
        width: 26px;
      }
      &.btn-reset {
        background: #fff;
        border: 1px solid #ccc;
        border-radius: 50%;
        font-size: 10px;
        height: 20px;
        left: 92px;
        line-height: 20px;
        padding: 0;
        top: 5px;
        width: 20px;
        z-index: -1;
      }
    }
  }
  &.thirteen,
  &.fourteen {
    input {
      background: none;
      border-color: #000;
      border-radius: 15px;
      border-width: 0 0 1px;
      transition: all .8s ease-in-out;
      width: 30px;
      &:focus {
        background: radial-gradient(ellipse at top left, transparent 65%, hotpink 140%);
        border-radius: 0 15px 15px 0;
        width: 250px;
        ~ button {
          &.btn-search {
            background: hotpink;
            color: #fff;
            left: 222px;
            transform: rotate(720deg);
          }
          &.btn-reset {
            left: 256px;
            transform: rotate(360deg);
          }
        }
      }
    }
    button {
      transition: all .8s ease-in-out;
      &.btn-search {
        background: #ccc;
        border: 1px solid #000;
        border-radius: 50%;
        height: 30px;
        left: 0;
        width: 30px;
      }
      &.btn-reset {
        background: #fff;
        border: 1px solid #ccc;
        border-radius: 50%;
        font-size: 10px;
        height: 20px;
        left: 2px;
        line-height: 20px;
        padding: 0;
        top: 10px;
        width: 20px;
        z-index: -1;
      }
    }
  }
}
@keyframes bounceRight {
  0% {
    transform: translateX(0px);
  }
  50% {
    transform: translateX(10px);
  }
  100% {
    transform: translateX(0px);
  }
}
@keyframes jumpTowardSearch {
  0% {
    background: #ccc;
    opacity: 1;
    transform: rotateZ(0deg) scale(1);
  }
  20% {
    background: #ccc;
    opacity: 0;
    transform: rotateZ(-60deg) scale(50);
  }
  55% {
    background: hotpink;
    opacity: 0;
    transform: rotateZ(-30deg) scale(100);
  }
  90% {
    background: hotpink;
    opacity: 0;
    transform: rotateZ(-30deg) scale(50);
  }
  100% {
    background: hotpink;
    opacity: 1;
    transform: rotateZ(0deg) scale(1);
  }
}
@keyframes jumpTowardReset {
  0% {
    opacity: 0;
    transform: rotateZ(0deg) scale(1);
  }
  20% {
    opacity: 0;
    transform: rotateZ(-60deg) scale(50);
  }
  55% {
    opacity: 0;
    transform: rotateZ(-30deg) scale(100);
  }
  90% {
    opacity: 0;
    transform: rotateZ(-30deg) scale(50);
  }
  100% {
    opacity: 1;
    transform: rotateZ(0deg) scale(1);
  }
}
!

JS 

              
                $('body')
  .on('click', 'div.three button.btn-search', function(event) {
    event.preventDefault();
    var $input = $('div.three input');
    $input.focus();
    if ($input.val().length() > 0) {
      // submit form
    }
  })
  .on('click', 'div.four button.btn-search', function(event) {
    event.preventDefault();
    var $input = $('div.four input');
    $input.focus();
    if ($input.val().length() > 0) {
      // submit form
    }
  })
  .on('click', 'div.five button.btn-search', function(event) {
    event.preventDefault();
    var $input = $('div.five input');
    $input.focus();
    if ($input.val().length() > 0) {
      // submit form
    }
  })
  .on('click', 'div.six button.btn-search', function(event) {
    event.preventDefault();
    var $input = $('div.six input');
    $input.focus();
    if ($input.val().length() > 0) {
      // submit form
    }
  })
  .on('click', 'div.thirteen button.btn-search', function(event) {
    event.preventDefault();
    var $input = $('div.thirteen input');
    $input.focus();
    if ($input.val().length() > 0) {
      // submit form
    }
  })
  .on('click', 'div.fourteen button.btn-search', function(event) {
    event.preventDefault();
    var $input = $('div.fourteen input');
    $input.focus();
    if ($input.val().length() > 0) {
      // submit form
    }
  })
;
!
999px

Console