#Floating_Ad{
    width: 200px;
    height: 200px;
    position: fixed;
    background: url("https://images.cnblogs.com/cnblogs_com/lucascube/1913649/o_210111134637circle.png");
    left:0px;
    top:0px;
    z-index:100000;
    cursor:pointer;
    filter:brightness(100%);
    animation: floatKF 0.1s;
    animation-iteration-count:infinite;
    animation-direction: alternate-reverse;

}
body{
background:url(https://images.cnblogs.com/cnblogs_com/lucascube/1913649/o_210111133416BG_2.jpg);
}