純css簡單的警告框加抖動效果

這種效果的警告框，出錯了會抖動

.alert-box {
          width: px;
          border-style: outset;
          position: relative;
          color:#555;
          border-radius:px;
          font-family:Tahoma,Geneva,Arial,sans-serif;font-size:px;
          padding:px px px px;
          margin:auto;
          display: none;
      }

      .alert-box span {
          font-weight:bold;
          text-transform:uppercase;
      }

      .error {
          background:#ffecec no-repeat px %;
          border:px solid #f5aca6;
      }
           

jQuery的動畫效果，animate for循環4次左右移動

var $box = $('.alert-box');
                  $box.html('<span>error: </span>' + data.error);
                  $box.show();
                  var box_left = ($(window).width() -  $box.width()) / ;
                  for(var i=; >=i; i++){
                      $box.animate({left:-(-*i)},);
                      $box.animate({left:+*(-*i)},);
                  }