body {
    background-image: url("../img/bg_about.png");
    background-size: cover;
}

.about-container {
    width: 100vw;
    height: 100vh;
    color: white;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1440px;
    width: 100%;
    padding: 1.2rem 2.2rem;
    box-sizing: border-box;
    margin: 0 auto;
    z-index: 1000;
}

.header .logo {
    display: block;
    height: 3.5rem;
    -o-object-fit: cover;
    object-fit: cover;
}

.header .nav {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.header .nav .nav-item.active {
    color: white
}

.header .nav .nav-item {
    font-size: 1rem;
    letter-spacing: 0;
    text-align: center;
    margin-left: 4rem;
    color: rgba(255, 255, 255, 0.5);
}

.header .nav .nav-item img {
    height: 0.8rem;
}

.about-main {
    flex: 1;
    max-width: 1440px;
    width: 100%;
    margin: 0 auto;
    z-index: 1000;
    padding: 1.2rem 2.2rem;
    box-sizing: border-box;
}

.about-main p {
    line-height: 1.8rem;
}

.footer {
    max-width: 1440px;
    text-align: center;
    margin: 5vh auto;
}

.mobile-arrow-up {
    display: none;
}

.mobile-menu {
    display: none;
}

.mobile-menu-container {
    display: none;
}

@media (max-width: 640px) {
    body {
        background-image: url("../img/bg.png");
    }

    .about-container{
        overflow: auto;
    }

    .header .nav {
        display: none !important;
    }

    .mobile-arrow-up {
        display: flex;
        align-items: center;
        justify-content: center;
        margin-top: 2rem;
        animation-duration: 3s;
        animation-fill-mode: forwards;
    }

    .mobile-arrow-up img {
        width: 1.3rem;
    }

    .mobile-menu {
        display: block;
    }

    .mobile-menu img,.mobile-menu-close img {
        height: 2.5rem;
    }

    .mobile-menu-container {
        position: fixed;
        z-index: 1200;
        top: 0;
        right: 0;
        left: 0;
        bottom: 0;
        background-color: black;
        background-image: url("../img/bg_nav-mobile.png");
        background-size: cover;
    }

    .mobile-menu-container ul {
        width: 70vw;
        list-style: none;
        margin: 0 auto;
        box-sizing: border-box;
    }

    .mobile-menu-container ul li {
        margin: 3rem 0;
    }

    .mobile-menu-container ul li a {
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }
}