*{
    margin: 0;
    padding: 0;
}
body{
    max-width: 720px;
    text-align: center;
    margin: 0 auto;
}
.box{
    width: 100%;
    position: relative;
    max-width: 720px;
}
.logo{
    position: absolute;
    width: 42%;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
}
.w100{
    width: 100%;
}
img{
    display: block;
}
.bt01{
    display: block;
}
.down {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    z-index: 1;
    max-width: 720px;
}
.kefu {
    position: fixed; /* 保持固定位置，随滚动条移动 */
    right: 0;
    width: 23%;
    top: 0;
    max-width: 200px;
    z-index: 2;
}

@keyframes moveUpDown {
    0% {
        transform: translateY(0);
    }
    100% {
        transform: translateY(5px);
    }
}

.bt02{
    display: block;
}
.tan{
position: fixed;
left: 0px;
top: 0px;
width: 100%;
height: 100%;
z-index: 999;
background:rgba(0,0,0,0.6);
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
}
.tanin{
display: flex;
flex-direction: column;
align-items: center;
}
.tanin1 img{
width: 80%;
margin-left:10%;
animation: hob_shake 2s infinite;
-webkit-animation: hob_shake 2s infinite;
}
.tanin2 img{
width: 3rem;
margin-top: .3rem;
}
@keyframes hob_shake {
	15%,
	45% {
		-webkit-transform: rotate(3deg);
		transform: rotate(3deg);
		transform-origin: 50% 100%
	}
	30% {
		-webkit-transform: rotate(-3deg);
		transform: rotate(-3deg);
		transform-origin: 50% 100%
	}
	60%,
	100% {
		-webkit-transform: rotate(0deg);
		transform: rotate(0deg);
		transform-origin: 50% 100%
	}
}