html, body {
    overflow: hidden;
    height: 100%;
}

a {
    text-decoration: none;
    color: #fff;
}

.cus-nav {
    position: fixed;
    height: 60px;
    line-height: 60px;
    width: 100%;
    z-index: 100;
    overflow: hidden;
    background: rgba(0, 0, 0,0.8)
}

    .cus-nav .nav-logo {
        height: 100%;
        position: absolute;
        top: 0;
        left: 18px;
        line-height: 60px;
    }

.cus-mask {
    pointer-events: none;
    width: 100%;
    height: 100%;
    background: #000;
    opacity: 0.8;
}

.nav-menu {
    height: 100%;
    line-height: 60px;
    top: 0;
    right: 18px;
}

.cus-menu-btn {
}

.cus-menu {
    border-top: 1px solid #fff;
    z-index: 100;
    top: 60px;
    width: 100%;
    overflow: hidden;
    position: fixed;
    display: none;
}

.menu-box {
    width: 100%;
    top: 48%;
}

.menu-item {
    width: 100%;
    font-size: 100px;
    line-height: 150px;
    text-align: center;
}

    .menu-item a {
        text-decoration: none;
        color: #fff;
    }

.btn-more {
    z-index: 10;
    background-color: #252525;
    font-size: 16px;
    padding: 8px 15px;
    font-style: oblique;
}

.btn-more-case {
    bottom: 50px;
    right: 40px;
    padding: 8px 15px;
}

.btn-more-about {
    top: 60vh;
    left:50%;
    padding: 8px 40px;
}