<div class="stickyWrap">
  <div id="header">content</div>
   <div id="nav">content</div>
</div>

#header{
    -webkit-transition: all 0.3s linear 0s;
    -moz-transition: all 0.3s linear 0s;
    -o-transition: all 0.3s linear 0s;
    transition: all 0.3s linear 0s;
    -webkit-backface-visibility: hidden; /* Chrome, Safari, Opera */
    backface-visibility: hidden;
    padding: 20px 0;
}
.stickyWrap.sticky {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 99;
}

.stickyWrap.sticky #header {
    padding: 5px 0;
    -webkit-transition: all 0.2s ease-in-out 0s;
    -moz-transition: all 0.2s ease-in-out 0s;
    -o-transition: all 0.2s ease-in-out 0s;
    transition: all 0.2s ease-in-out 0s;
    -webkit-backface-visibility: hidden; /* Chrome, Safari, Opera */
    backface-visibility: hidden;
}

.myAnimatingClass{
    transform: translate3d(0,0,0);
}