#letStart {

    position: relative;
    -webkit-animation-name: example; 
    -webkit-animation-duration: 4s; 
    animation-name: example;
    animation-duration: 4s;
}



/* Standard syntax */
@keyframes example {
    0%   {background-color:red; left:0px; top:200px;}
    100%  {background-color:red; left:0px; top:0px;}
    
}