.banner {
    position: relative;
    width: 100%;
    height: 500px;
    box-sizing: border-box;
    z-index: 3;
    color: #fff;
    background:#314d67 url(../image/banner-index4.png) center no-repeat;
    background-size: cover;
    padding-top: 220px;
}
.banner .bannertext {
    text-align: center;
    font-size: 48px;
    font-weight: 600;
    margin: 0 auto;
}
.Rearth{
    position: absolute;
    left: calc(50% - 150px);
    top:100px;
    z-index: -99;
}
.Rearth img{
    animation: newsearth 200s infinite;
}
@keyframes newsearth{
    0% {transform: rotate(0);}
    100% {transform: rotate(1turn);}
}