css实现一个全屏下拉菜单效果代码-html代码-BFW代码库

代码语言：html

代码描述：css实现一个全屏下拉菜单效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开


<!DOCTYPE html>
<html lang="en" >

<head>

  <meta charset="UTF-8">

  
<style>
@import url(https://fonts.googleapis.com/css?family=Work+Sans:400,300,700|Open+Sans:400italic,300italic);
body {
  background-color: #fff;
  padding: 0;
  margin: 0;
}

.home {
  width: 100%;
  height: 100vh;
  position: relative;
  background-image: url(//repo.bfw.wiki/bfwrepo/image/5fd82faab9c8f.png?x-oss-process=image/auto-orient,1/resize,m_fill,w_800,h_600,/quality,q_90);
  background-size: cover;
  background-position: center center;
}


/* ====================================
Navigation 
==================================== */

.overlay-navigation {
  position: fixed;
  z-index: 99;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: hsla(0, 0%, 0%, 0.8);
  -webkit-transform: translateY(-100%);
          transform: translateY(-100%);
}

.overlay-slide-down {
  -webkit-transition: all .4s ease-in-out;
  transition: all .4s ease-in-out;
  -webkit-transform: translateY(0);
          transform: translateY(0)
}

.overlay-slide-up {
  -webkit-transition: all .8s ease-in-out;
  transition: all .8s ease-in-out;
  -webkit-transform: translateY(-100%);
          transform: translateY(-100%)
}

nav,
nav ul {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

nav ul {
  display: -webkit-box;
  display: flex;
  list-style: none;
}

nav ul li {
  flex-basis: 20%;
  -webkit-box-pack: center;
          justify-content: center;
  -webkit-box-align: center;
          align-items: center;
  height: 100%;
  overflow: hidden;
  -webkit-transform: translateY(-100%);
          transform: translateY(-100%);
}

nav li a {
  position: relative;
  top: 46%;
  color: #fff;
  text-transform: uppercase;
  font-family: 'Work sans', sans-serif;
  font-weight: 300;
  letter-spacing: 4px;
  text-decoration: none;
  display: block;
  text-align: center;
  font-size: 0.9rem;
}

nav li a:before {
  content: '';
  width: 70px;
  height: 2px;
  background-color: #fff;
  position: absolute;
  top: 50%;
  left: 0;
  z-index: 100;
  -webkit-transform: translateX(-100%);
          transform: translateX(-100%);
  opacity: 0;
  -webkit-transition: all .2s linear;
  transition: all .2s linear;
}

nav li a:after {
  content: attr(data-content);
  font-size: 0.7rem;
  -webkit-transition: all .2s linear;
  transition: all .2s linear;
  opacity: 0;
  position: absolute;
  z-index: 100;
  color: #fff;
  display: block;
  margin-right: auto;
  margin-left: auto;
  left: 0;
  right: 0;
  bottom: -50px;
  text-transform: none;
  font-family: 'Open sans', serif;
  font-weight: 300;
  font-style: italic;
  letter-spacing: 0;
}

nav li a:hover:before {
  -webkit-transform: translateX(0);
          transform: translateX(0);
  opacity: 1;
}

nav li a:hover:after {
  -webkit-transform: translateY(15px);
          transform: translateY(15px);
  opacity: 1;
}

nav li:nth-of-type(1){background-color: #29363B}
nav li:nth-of-type(2){background-color: #EA495F}
nav li:nth-of-type(3){background-color: #F4837D}
nav li:nth-of-type(4){background-color: #FDCEA9}
nav li:nth-of-type(5){background-color: #99B998}

.slide-in-nav-item {
  -webkit-animation: slide-in-nav-item 0.4s linear 1 .2s both;
          animation: slide-in-nav-item 0.4s linear 1 .2s both;
}

.slide-in-nav-item-delay-1 {
  -webkit-animation: slide-in-nav-item 0.4s linear 1 .4s both;
          animation: slide-in-nav-item 0.4s linear 1 .4s both;
}

.slide-in-nav-item-delay-2 {
  -webkit-animation: slide-in-nav-item 0.4s linear 1 .6s both;
          animation: slide-in-nav-item 0.4s linear 1 .6s both;
}

.slide-in-nav-item-delay-3 {
  -webkit-animation: slide-in-nav-item 0.4s linear 1 .8s both;
          animation: slide-in-nav-item 0.4s linear 1 .8s both;
}

.slide-in-nav-item-delay-4 {
  -webkit-animation: slide-in-nav-item 0.4s linear 1 1s both;
          animation: slide-in-nav-item 0.4s linear 1 1s both;
}

.slide-in-nav-item-reverse {
  -webkit-animation: slide-in-nav-item-reverse .3s linear 1 .5s both;
          animation: slide-in-nav-item-reverse .3s linear 1 .5s both;
}

.slide-in-nav-item-delay-1-reverse {
  -webkit-animation: slide-in-nav-item-reverse .3s linear 1 .4s both;
          animation: slide-in-nav-item-reverse .3s linear 1 .4s both;
}

.slide-in-nav-item-delay-2-reverse {
  -webkit-animation: slide-in-nav-item-reverse .3s linear 1 .3s both;
          animation: slide-in-nav-item-reverse .3s linear 1 .3s both;
}

.slide-in-nav-item-delay-3-reverse {
  -webkit-animation: slide-in-nav-item-reverse .3s linear 1 .2s both;
          animation: slide-in-nav-item-reverse .3s linear 1 .2s both;
}

.slide-in-nav-item-delay-4-reverse {
  -webkit-animation: slide-in-nav-item-reverse .3s linear 1 both;
          animation: slide-in-nav-item-reverse .3s linear 1 both;
}


/* ====================================
Burger king
==================================== */

.open-overlay {
  position: absolute;
  right: 5rem;
  top: 3.2rem;
  z-index: 100;
  width: 34px;
  display: block;
  cursor: pointer;
}

.open-overlay span {
  display: block;
  height: 1px;
  background-color: #fff;
  cursor: pointer;
  margin-top: 8px;
}

.animate-top-bar {
  -webkit-animation: animate-top-bar .6s linear 1 both;
          animation: animate-top-bar .6s linear 1 both
}

.animate-bottom-bar {
  -webkit-animation: animate-bottom-bar .6s linear 1 both;
          animation: animate-bottom-bar .6s linear 1 both
}

.animate-middle-bar {
  -webkit-animation: animate-middle-bar .6s linear 1 both;
          animation: animate-middle-bar .6s linear 1 both
}

.animate-out-top-bar {
  -webkit-animation: animate-out-top-bar .6s linear 1 both;
          animation: animate-out-top-bar .6s linear 1 both
}

.animate-out-bottom-bar {
  -webkit-animation: animate-out-bottom-bar .6s linear 1 both;
          animation: animate-out-bottom-bar .6s linear 1 both
}

.animate-out-middle-bar {
  -webkit-animation: animate-out-middle-bar .6s linear 1 both;
          animation: animate-out-middle-bar .6s linear 1 both
}


/* ====================================
Animation keyframes
==================================== */

@-webkit-keyframes slide-in-nav-item {
  from {
    -webkit-transform: translateY(-100%);
    transform: translateY(-100%)
  }
  to {
    -webkit-transform: translateY(0);
    transform: translateY(0)
  }
}

@keyframes slide-in-nav-item {
  from {
    -webkit-transform: translateY(-100%);
    transform: translateY(-100%)
  }
  to {
    -webkit-transform: translateY(0);
    transform: translateY(0)
  }
}

@-webkit-keyframes slide-in-nav-item-reverse {
  from {
    -webkit-transform: translateY(0);
    transform: translateY(0)
  }
  to {
    -webkit-transform: translateY(-100%);
    transform: translateY(-100%)
  }
}

@keyframes slide-in-nav-item-reverse {
  from {
    -webkit-transform: translateY(0);
    transform: translateY(0)
  }
  to {
    -webkit-transform: translateY(-100%);
    transform: translateY(-100%)
  }
}

@-webkit-keyframes animate-top-bar {
  0% {
    background-color: #fff;
  }
  50% {
    -webkit-transform: translateY(9px);
    transform: translateY(9px)
  }
  80% {
    -webkit-transform: translateY(5px);
    transform: translateY(5px);
    background-color: #fff
  }
  100% {
    -webkit-transform: translateY(0);
    transform: translateY(0);
    background-color: #29363B;
  }
}

@keyframes animate-top-bar {
  0% {
    background-color: #fff;
  }
  50% {
    -webkit-transform: translateY(9px);
    transform: translateY(9px)
  }
  80% .........完整代码请登录后点击上方下载按钮下载查看