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#dynamic_logo img{
filter: alpha(opacity=0);opacity:0;}

#dynamic_logo{
background-image: url(圖);
background-repeat: no-repeat;
height: 300px;
width: 350px;
margin-top: 50px;
margin-right: 0px;
z-index: -2;
animation: MoveUpDown 2s ease-in-out infinite;
bottom: initial !important;
}

@keyframes MoveUpDown {
0%, 100% {
margin-top: 50px; /* 基本位置 */
}
50% {
margin-top: 100px; /* 移動多少 */
}
}