baidu/first.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-transform: capitalize;
    outline: none;
    border: none;
    text-decoration: none;
    transition: all .2s linear;
    scroll-behavior: smooth;
}

/* 导航栏.css */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: #333;
    z-index: 1000;
    display: flex;
    align-items: center;
    /*垂直参数分布*/
    justify-content: center;
    /*水平参数分布*/
    padding: 1rem 5%;
}

header .logo span {
    color: #b0d8ff;
}

header .logo {
    font-size: 1.5rem;
    font-weight: bolder;
    color: #fff;
    text-transform: uppercase;
}

header .navbar a {
    color: #fff;
    font-size: 1rem;
    font-weight: bold;
    margin: 0 .8rem;
}

header .navbar a:hover {
    color: #b0d8ff;
}

/*搜索*/
header .search form {
    position: relative;
    width: 400px;
    max-width: 100%;
}

header .search form input {
    border: 0;
    border-radius: 50px;
    font-size: 16px;
    padding: 15px 30px;
    width: 100%;
}

header .search form button {
    position: absolute;
    top: 2px;
    right: 2px;
    background-color: #0A64B4;
    border: 0;
    border-radius: 50px;
    color: #fff;
    font-size: 16px;
    padding: 13px 30px;
}



/* 登录表单 */
header .login a {
    position: fixed;
    top: 2px;
    right: 2px;
    background-color: #5abcdd;
    border: 0;
    border-radius: 50px;
    font-size: 16px;
    padding: 13px 30px;
}

header .login a button {
    background-color: #5abcdd;
    font-size: 20px;
    color: white;
}

header .login a button:hover {
    color: #b0d8ff;
}

/* 主页的视频播放区 */

.home {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    position: relative;
    z-index: 0;
}

.home .content {
    text-align: center;
}

.home .content h3 {
    font-size: 2rem;
    color: #fff;
    text-transform: uppercase;
    text-shadow: 0 .3rem .5rem rgba(0, 0, 0, .1);
}

.home .content p {
    font-size: 2rem;
    color: #fff;
    padding: .5rem 0;
}

.home .video-container video {
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    height: 100%;
    width: 100%;
    object-fit: cover;
}


.home .controls {
    padding: 0.5rem;
    border-radius: 4rem;
    background: #5abcdd;
    position: relative;
    top: 10rem;
}

.home .controls .vid-btn {
    height: 2rem;
    width: 2rem;
    display: inline-block;
    border-radius: 50%;
    background: #fff;
    cursor: pointer;
    margin: 0 .5rem;
}

.home .controls .vid-btn.active {
    background: #4981b2;
}

/* 底部 */
.footer {
    background: #333;
}

.footer .box-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer .box-container .box {
    padding: 1rem 0;
    flex: 1 1 12rem;
}

.footer .box-container .box h3 {
    font-size: 1.5rem;
    padding: .5rem 0;
    color: #fff;
}

.footer .box-container .box p {
    font-size: 1.0rem;
    padding: .5rem 0;
    color: #eee;
}

.footer .box-container .box a {
    display: block;
    font-size: 1rem;
    padding: .5rem 0;
    color: #eee;
}

.footer .box-container .box a:hover {
    color: #ffa500;
    text-decoration: underline;
}

.footer .credit {
    text-align: center;
    padding: 1rem 0.5rem;
    margin-top: 0.5rem;
    font-size: 1rem;
    font-weight: normal;
    color: #fff;
    border-top: .1rem solid rgba(255, 255, 255, .2);
}

.footer .credit span {
    color: #ffa500;
}

/* 设配多端 */
#menu-bar {
    color: #fff;
    border: .1rem solid #fff;
    border-radius: .5rem;
    font-size: 1.5rem;
    padding: .5rem 1rem;
    cursor: pointer;
    display: none;
}

@media (max-width:1200px) {

    html {
        font-size: 80%;
    }

}

@media (max-width:768px) {

    #menu-bar {
        display: initial;
    }

    header .navbar {
        position: absolute;
        top: -1000%;
        right: 0;
        left: 0;
        background: #333;
        border-top: .1rem solid rgba(255, 255, 255, .2);
        padding: 1rem 1.5rem;
    }

    header .navbar.active {
        top: 100%;
    }

    header .navbar a {
        display: block;
        border-radius: .5rem;
        padding: 1rem;
        margin: 1rem 0;
        background: #222;
    }

}

@media (max-width:450px) {

    html {
        font-size: 60%;
    }

    .footer .box-container .box {
        flex: 1 1 18rem;
        padding: 1rem 0;
        text-align: center;
    }

}