nav {
    background-color: #001427;
    /*background-attachment:scroll;*/
}

body {
    background: linear-gradient(180deg, #001427 0, #002142 30%);
    background-attachment: fixed;
}

.logo {
    width: 34px;
    position: absolute;
    top: 20px;
    left: 20px;
}

.nav-link {
    font-size: 20px;
}

.navbar .navbar-toggler .navbar-toggler-icon {
    background-image: url('../pic/icons8-menu-24.png');
}


/*平板以下*/

@media (max-width:990px) {
    nav ul {
        text-align: center;
    }
}

hr{
    background-color: white;
}