#belly {
    position: fixed;
    bottom: 0px;
    left: 0px;
    z-index: 100;
    opacity: 1 !important;

	animation-name: belly;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-duration: 2.5s;
}
#belly img{width:200px;}

.pc{display:block;}
.sp{display:none;}

@keyframes belly {
    0% {transform: translate(0,0px);}
    100% {transform: translate(0,-100px)}
}

@media screen and (max-width: 980px) {
    .pc{display:none;}
    .sp{display:block;}
}

@media screen and (max-width: 480px) {
	#belly img{width:150px;}
}