* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 导航栏样式 */
nav {
    background-color: #f5f5f5;
    padding: 10px;
}

.navbar {
    list-style-type: none;
    display: flex;
    justify-content: flex-start;
}

.navbar li {
    position: relative;
}

.navbar li a {
    text-decoration: none;
    color: #000;
    padding: 10px 20px;
    display: block;
    font-family: Arial, sans-serif;
}

.navbar li a:hover {
    background-color: #575757;
}

/* 下拉菜单 */
.dropdown-content {
    display: none;
    position: absolute;
    background-color: #333;
    min-width: 160px;
    box-shadow: 0px 8px 16px rgba(0, 0, 0, 0.2);
}

.dropdown-content li {
    display: block;
}

.dropdown-content li a {
    padding: 10px 20px;
    color: white;
}

.dropdown-content li a:hover {
    background-color: #575757;
}

/* 显示下拉菜单 */
.dropdown:hover .dropdown-content {
    display: block;
}