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

body {
    font-family: Microsoft YaHei, sans-serif;
    background: #f5f5f5;
}

/* 固定导航栏 */
.game-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: #2c3e50;
    padding: 12px 0;
    text-align: center;
    z-index: 9999;
}

.game-nav a {
    color: #fff;
    text-decoration: none;
    margin: 0 14px;
    font-size: 15px;
}

.game-nav a:hover {
    color: #ffeb3b;
}

/* 内容不被导航挡住 */
.container {
    margin-top: 70px;
    padding: 20px;
}