CODE of BUTTON

<div style=" float: right; margin-right: 8% !important;" >
<div class="boxsearch">
     <div class="container-search">
          <form class="search-form" action="http://your_website/" method="get">
<script>
function check() {
    var search = $('#search').val();
    if(search.length >=2) {
        $('#submit').removeAttr('disabled');
    } else {
        $('#submit').attr('disabled', 'disabled');
    }
}
</script>
               <input type="search" id="search" onkeyup="check();" name="s" class="search-field" placeholder="Поиск..."  autocomplete="off" />
      <button type="submit" onkeyup="check();" class="icon" id="submit" disabled="disabled">
                    <i class="fa fa-search"></i>
               </button>
          </form>
     </div>
</div>
</div>
<div style="clear: right"></div>