*{
    margin: 0;
    padding: 0;
}

html,body{
    overflow-x: hidden;
}

/* 导航 */
.header {
    height: 80px;
    line-height: 80px;
    background: black;
    display: flex;
}

.logo {
    width: 10%;
    min-width: 80px;
    color: #fff;
    font-size: 2rem;
    text-align: center;
}

.nav {
    width: 80%;
    justify-content: center;
    display: flex;
    justify-content: center;
}

.nav-item {
    color: white;
    font-size: 20px;
    margin-left: 20px;
    list-style: none;
    float: left;
}

.nav-item a:hover {
    color: rgb(90, 90, 90);
}

.login {
    width: 10%;
}

a {
    color: white;
    text-decoration: none;
    display: flex;
}
.ser{    display: flex;
    transition: color .25s ease;
    text-decoration: none;
    color: #4a4a4a;
    border-radius: 30px;
text-decoration: underline;}


/* 页脚  */
.footer {
    width: 100%;
    height: 150px;
    background: black;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    padding-left: 5%;
    padding-right: 5%;

}

.footer-container {
    color: #fff;
}