* {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', SourceHanSansCN-Light;
}
a {
    text-decoration: none;
    cursor: pointer;
    color: #fff;
}
#app {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    background: #1D2027;
    overflow: hidden;
    color: #FFFFFF;
    padding-top: 0;
    position: relative;
}
.content {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.icon {
    width: 1.5rem;
    height: 1.5rem;
    margin-bottom: .4rem;
    border-radius: 0.25rem;
    border: 1px solid #1AE5A6;
}
.title {
    font-size: .4rem;
    margin-bottom: .2rem;
}
.desc {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0.4rem 0 0.25rem;
    padding: 0.2rem 0.5rem;
    border: 1px solid #fff;
    border-width: 1px 0 1px 0;
}
.welcome {
    margin-bottom: .5rem;
    font-size: .3rem;
}
.buttonGroup {
    display: flex;
    flex-wrap: wrap;
    flex-direction: column;
}
.button {
    display: block;
    font-size: .3rem;
    height: 0.6rem;
    width: 3.2rem;
    line-height: .6rem;
    text-align: center;
    border-radius: 0.6rem;
    border: 1px solid #fff;
    margin-bottom: 0.3rem;
}
.sub-title {
    font-size: .3rem;
    margin-bottom: 0.5rem;
}
.bg-wave {
    position: absolute;
    width: 5rem;
    height: 5rem;
}
.top-left {
    top: 1.5rem;
    left: -2.5rem;
    
}
.down-right {
    bottom: 0.8rem;
    right: -2.6rem;
}