CSS3 анимация не работает на Chrome

У меня есть анимация CSS3, которая отлично работает в Firefox, но не отображается в браузере Chrome. вы можете увидеть конечный результат на www.stamp4all.com, анимация - это стрелки, вращающиеся.

Вот код CSS:

/* Some stylesheet reset */
#sidemenu > ul {
  list-style: none;
  margin: 0;
  padding: 0;
  vertical-align: baseline;
  line-height: 1;

}
/* The container */
#sidemenu > ul {
  display: block;
  position: relative;
  width: 133px;
  /* The list elements which contain the links */

}
#sidemenu > ul li {
  display: block;
  position: relative;
  margin: 0;
  padding: 0;
  width: 100%;
}
/* General link styling */
#sidemenu > ul li a {
  /* Layout */

  display: block;
  position: relative;
  margin: 0;
  border-top: 0.14em dotted #3a3a3a;
  border-bottom: 0.14em dotted #1b1b1b;
  padding: 12px 15px;
  /* Typography */

  font-family: Helvetica, Arial, sans-serif;
  color: #d8d8d8;
  text-decoration: none;
  text-transform: uppercase;
  text-shadow: 0 1px 1px #000;
  font-size: 15px;
  font-weight: 300;
  /* Background & effects */

  background: #282828;   /*  !!! animated menue background !!!! */
}

#sidemenu > ul li > a {
    border-radius:10px;
}


/* The hover state of the menu/submenu links */
#sidemenu > ul li > a:hover,
#sidemenu > ul li:hover > a {
  color: #ffffff;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.3);
  background: #52cef0;
  background: -webkit-linear-gradient(#70d5f1, #52cef0);
  background: -moz-linear-gradient(#70d5f1, #52cef0);
  background: linear-gradient(#70d5f1, #52cef0);
  border-color: transparent;
}
/* The arrow indicating a submenu */
#sidemenu > ul .has-sub > a::after {
  content: '';
  position: absolute;
  top: 16px;
  right: 120px;
  width: 0px;
  height: 0px;
  /* Creating the arrow using borders */

  border: 5px solid transparent;
  border-right: 5px solid #d8d8d8;

    /* effect, rotate 720 the arrows */
  -webkit-transition: transform 1.5s;
  -moz-transition: transform 1.5s;
  transition: transform 1.5s;
}
/* The same arrow, but with a darker color, to create the shadow effect */
#sidemenu > ul .has-sub > a::before {
  content: '';
  position: absolute;
  top: 15px;
  right: 120px;
  width: 0px;
  height: 0px;
  /* Creating the arrow using borders */

  border: 6px solid transparent;
  border-right: 6px solid #000;

    /* effect, rotate 720 the arrows */
  -webkit-transition: transform 1.5s;
  -moz-transition: transform 1.5s;
  transition: transform 1.5s;
}
/* Changing the color of the arrow on hover */
#sidemenu > ul li > a:hover::after,
#sidemenu > ul li:hover > a::after {
  border-right: 4px solid #ffffff;
  transform: rotate(720deg);
}
#sidemenu > ul li > a:hover::before,
#sidemenu > ul li:hover > a::before {
  border-right: 4px solid rgba(0, 0, 0, 0.3);
  transform: rotate(720deg);
}
/* THE SUBMENUS */
#sidemenu > ul ul {
  position: absolute;
  right: 100%;
  top: -9999px;
  padding-right: 3px;
  opacity: 0;
  width: 0px;
  /* The fade effect, created using an opacity transition */

  -webkit-transition: opacity 1.3s, width 1s, transform 0.7s;
  -moz-transition: opacity  1.3s, width 1s, transform 0.7s;
  transition: opacity  1.3s, width 1s, transform 0.7s;

}
/* Showing the submenu when the user is hovering the parent link */
#sidemenu > ul li:hover > ul {
  top: 0px;
  opacity: 1;
  width: 110px;
}

И HTML-код:

<div id="sidemenu">
<ul> 
    <li><a href="index.php?main=include/about_us.html" >אודות</a></li> 
    <li class='has-sub'><a href="index.php?main=products" >חותמת מלבנית</a>
        <ul>
            <li><a href="index.php?main=products/rectangle/p20.html" >P20 - 14X38מ"מ</a></li>
            <li><a href="index.php?main=products/rectangle/p30.html" >P30 - 18X47מ"מ</a></li>
            <li><a href="index.php?main=products/rectangle/p40.html" >P40 - 23X59מ"מ</a></li>
            <li><a href="index.php?main=products/rectangle/p45.html" >P45 - 25X82מ"מ</a></li>
            <li><a href="index.php?main=products/rectangle/p50.html" >P50 - 30X69מ"מ</a></li>
            <li><a href="index.php?main=products/rectangle/p60.html" >P60 - 37X76מ"מ</a></li>
        </ul>
    </li>
    <li class='has-sub'><a href="#" >חותמת מרובעת</a>
        <ul>
            <li><a href="#" >Q30 - 14X38mm</a></li>
            <li><a href="#" >Q43 - 18X47mm</a></li>
        </ul>
    </li> 
    <li class='has-sub'><a href="#" >חותמת עגולה</a>
        <ul>
            <li><a href="#" >R12 - 14X38mm</a></li>
            <li><a href="#" >R17 - 18X47mm</a></li>
            <li><a href="#" >R24 - 18X47mm</a></li>
            <li><a href="#" >R40 - 18X47mm</a></li>
            <li><a href="#" >R50 - 18X47mm</a></li>
        </ul>
    </li> 
    <li class='has-sub'><a href="#" >חותמת תאריך</a>
        <ul>
            <li><a href="#" >S120 - 14X38mm</a></li>
            <li><a href="#" >S160 - 18X47mm</a></li>
            <li><a href="#" >S360 - 18X47mm</a></li>
            <li><a href="#" >S660 - 18X47mm</a></li>
        </ul>
    </li> 
    <li><a href="index.php?main=contuct_us" >צור קשר</a></li> 
</ul> 
</div>

Почему он не вращается в хроме?