html：
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<body><!-- 导航 --><nav class="navbar navbar-expand-lg bg-body-tertiary fixed-top"><div class="container"><a class="navbar-brand" href="#"><img src="./assets/images/logo.png" alt=""></a><button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation"><span class="navbar-toggler-icon"></span></button><div class="collapse navbar-collapse" id="navbarNavAltMarkup"><div class="navbar-nav"><a class="nav-link active" aria-current="page" href="#">首页</a><a class="nav-link" href="#">博客</a><a class="nav-link" href="#">Github</a><a class="nav-link" href="#">TWeb Conf</a><a class="nav-link" href="#">SuperStar</a><a class="nav-link" href="#">Web前端导航</a><a class="nav-link" href="#">关于</a></div></div></div>
</nav><!-- 轮播图 --><div id="carouselExampleIndicators" class="carousel slide"><div class="carousel-indicators"><button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button><button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="1" aria-label="Slide 2"></button><button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="2" aria-label="Slide 3"></button><button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="3" aria-label="Slide 4"></button></div><div class="carousel-inner"><div class="carousel-item active"></div><div class="carousel-item"></div><div class="carousel-item"></div><div class="carousel-item"></div></div><button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide="prev"><span class="carousel-control-prev-icon" aria-hidden="true"></span><span class="visually-hidden">Previous</span></button><button class="carousel-control-next" type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide="next"><span class="carousel-control-next-icon" aria-hidden="true"></span><span class="visually-hidden">Next</span></button>
</div><!-- 开源项目 --><div class="project container"><!-- 标题 --><div class="title"><h2>OpenSource / 开源项目</h2><p>种类众多的开源显项目，让你爱不释手</p></div><!-- 内容 --><div class="content"><div class="row"><div class="col-lg-3 col-md-6"><a href="#"><img src="./assets/images/omi.png" alt=""><h3>OMI</h3><p>开放现代的Web组件框架</p></a></div><div class="col-lg-3 col-md-6"><a href="#"><img src="./assets/images/alloyimage.png" alt=""><h3>OMI</h3><p>开放现代的Web组件框架</p></a></div><div class="col-lg-3 col-md-6"><a href="#"><img src="./assets/images/alloytouch.png" alt=""><h3>OMI</h3><p>开放现代的Web组件框架</p></a></div><div class="col-lg-3 col-md-6"><a href="#"><img src="./assets/images/soda.png" alt=""><h3>OMI</h3><p>开放现代的Web组件框架</p></a></div></div></div></div><script src="./Bootstrap/js/bootstrap.min.js"></script>
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less:
// out: ../css/// 导航.bg-body-tertiary{background-color: transparent !important;.navbar-collapse{flex-grow: 0;}.navbar-nav .nav-link.active, .navbar-nav .show>.nav-link{color: yellow;}.nav-link:nth-child(4){background-image: url(../assets/images/fire.png);background-repeat: no-repeat;background-position: left center;padding-left: 20px;background-size: 15px 15px;color: yellow;}
}// 轮播图:小于768图片高度250 max 大于等于768图片高度400 min 大于等于992图片高度500
.carousel{// 响应式---->媒体查询@media (max-width:768px) {.carousel-item{height: 250px;}}@media (min-width:768px) {.carousel-item{height: 400px;}}@media (min-width:992px) {.carousel-item{height: 500px;}}.carousel-item{// height: 500px;background-size: cover;background-position: center 0;}.carousel-item:nth-child(1){background-image: url(../assets/uploads/banner_1.jpg);}.carousel-item:nth-child(2){background-image: url(../assets/uploads/banner_2.jpg);}.carousel-item:nth-child(3){background-image: url(../assets/uploads/banner_3.jpg);}.carousel-item:nth-child(4){background-image: url(../assets/uploads/banner_4.jpg);}}// 开源项目
// 视口宽度大于992：一行排4个盒子 col-lg-3
// 视口宽度大于768：一行排2个盒子 col-md-3.project{margin-top: 60px;text-align: center;.row{div{margin-bottom: 10px;height: 500px;// background-color: pink;a{//块级的宽度和父级一样大display: block;height: 200px;background-color: green;border-radius: 4px;text-decoration: none;}&:nth-child(1) a{background-color: #70c3ff;}&:nth-child(1) a img{margin-top: 10px;margin-bottom: 15px;}&:nth-child(2) a{background-color: #fd6a7f;}&:nth-child(2) a img{margin-top: 10px;margin-bottom: 15px;}&:nth-child(3) a{background-color: #7f8ea0;}&:nth-child(3) a img{width: 160px;height: 60px;margin-top: 10px;margin-bottom: 15px;object-fit: contain;}&:nth-child(4) a{background-color: #89d04f;}&:nth-child(4) a img{width: 160px;height: 60px;margin-top: 10px;margin-bottom: 15px;object-fit: contain;}transition: all 0.5s;h3{color: #fff;}p{color: #fff;}}div:hover{transform: translateY(-12px);}}
}
