css+div实现下拉菜单动画效果代码-html代码-BFW代码库

代码语言：html

代码描述：css+div实现下拉菜单动画效果代码

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>
.area::after {
  content: "";
  display: block;
  width: 101%;
}
</style>
  
  
  
<style>
:root {
  --clr: #2196f3;
  --bgc: #ffffff;
  --icon: #ffffff;
  --tra: all 0.5s ease 0s;
}

body {
  height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  background: linear-gradient(to bottom, #4e4376, #2b5876);
  font: 1em system-ui, sans-serif;
  line-height: 1.4;
}

body:before, body:after {
    content: "";
    position: absolute;
    width: 1em;
    height: 1em;
    border: 0em solid #fff;
    border-width:0 0 0.2em 0.2em;
    transform: rotate(45deg);
    left: 1.25em;
    bottom: 1.35em;
    border-radius: 0.1em;
}

body:after {
    left: inherit;
    right: 1.25em;
    transform: rotate(-135deg);
}

h2 {
  line-height: 1.25;
  margin: 1em 0 1em 0;
  color: #4d4476;
  font-weight: 500;
}


.area {
  background: 
    linear-gradient(-88.75deg, #fff0 1.5em, var(--bgc) calc(1.5em + 1px) 55%, #fff0 calc(55% + 1px)), 
    linear-gradient(88.75deg, #fff0 1.5em, var(--bgc) calc(1.5em + 1px) 55%, #fff0 calc(55% + 1px));
  padding: 3em 4em;
  width: 20em;
  transition: var(--tra);
  position: relative;
  /*overflow: auto;*/
  word-wrap: break-word;
  filter: drop-shadow(0px 10px 10px #0008);
}

.area:before {
  content: "";
  background: var(--clr);
  width: 100%;
  height: 3.5em;
  position: absolute;
  top: 0;
  left: 0;
  clip-path: polygon(0 0, 100% 0, 99% 100%, 1% 85%);
}

.area:after {
    content: "";
    background: linear-gradient(178.5deg, #fff0 1.15em, #fff calc(1.15em + 1px));
    width: calc(100% - 1em) !important;
    height: 1.75em;
    position: absolute;
    top: -1.75em;
    left: 0.5em;
}

.menu {
  position: absolute;
  top: 0.5rem;
  right: 1.5em;
}
.menu > button {
  border: 0;
  background: #fff0;
  transition: all 0.5s ease 0s;
  padding: 0.35em;
}
.menu-icon-svg {
  width: 2em;
  fill: #fff;
}
.menu-list {
  list-style: none;
    margin: 0;
    position: absolute;
    top: 3em;
    right: -0.4em;
    padding: 0;
    text-align: left;
    max-height: 0;
    overflow: hidden;
    transition: all 0.5s ease 0s;
    transform: rotate(1deg);
    width: 26em;
}

img {
  width: 100%;
  opacity: 0.25;
  margin-top: 0.5em;
  margin-bottom: -1em;
  transform: scale(0.9) scaleY(0.75);
  filter: invert(0.3) sepia(1.25) saturate(3) hue-rotate(190deg) brightness(1.25) contrast(1);
}

/*
.menu ul {
  animation: start 1s ease 0s 2 alternate;
  transition: max-height 0.5s ease 0s;
}
*/

.menu:hover ul {
  max-height: 10em;
  transition: max-height 0.5s ease 0s;
  box-shadow: 0.3em 1.25em 0.125em 0 #fff8;
}
.menu ul li {
  background: linear-gradient(89deg, #fff 0.15em, var(--clr) calc(0.15em + 1px));
  border-bottom: 0.25em solid #fff;
  position: relative;
}
.menu ul li:nth-child(2) {
  background: linear-gradient(89deg, #fff 0.225em, var(--clr) calc(0.225em + 1px));
}
.menu ul li:last-child {
  background: linear-gradient(88.5deg, #fff0 0.3em, var(--clr) calc(0.3em + 1px));
}
.menu:hover button {
  background: #fff0;
  transition: all 0.5s ease 0s;
  
  fill: #f60;
}

.menu-icon-svg {
  width: 2em;
  fill: #fff;
}

ul li a {
  padding: 0.5em;
  margin: 0 0.5em;
  display: block;
  text-decoration: none;
  font-weight: 500;
  color: #fff;
}


ul li a:before {
  content: "";
    position: absolute;
    box-sizing: border-box;
    width: 1em;
    height: 1em;
    right: 1.25em;
    top: 0.85em;
    border-radius: 0.1em;
    background: 
      conic-gradient(from 90deg at 65% 60%, var(--icon) 0 25%, #fff0 0 100%), conic-gradient(from 180deg at 35% 60%, var(--icon) 0 25%, #fff0 0 100%), 
      conic-gradient(from 135deg at 50% 0%, var(--icon) 0 25%, #fff0 0 100%);
    background-repeat: no-repeat;
    background-size: 100% 100%, 100% 100%, 100% 0.65em;
}
 ul li a:after {
  content: "";
   position: absolute;
   box-sizing: border-box;
   width: 1.2em;
   height: 1.2em;
   right: 1.1em;
   top: 0.65em;
   border: 0.25em solid var(--icon);
   border-right-width: 0;
   border-bottom-width: 0;
   transform: rotate(45deg);
   border-radius: 0.25em;
}



ul li:nth-child(2) a:before {
  content: "";
  position: absolute;
  box-sizing: border-box;
  background: 
    linear-gradient(180deg, var(--icon) 0 0.25em, #fff0 0 0.5em, var(--icon) 0 0.625em, #fff0 0 1.1em, var(--icon) 0 100%), 
    linear-gradient(90deg, var(--icon) 0 0.55em, #fff0 0 0.8em, var(--icon) 0 100%);
  width: 1.4em;
  height: 1.4em;
  margin-top: -0.35em;
  margin-right: -0.2em;
  border-radius: 100%;
}

ul li:nth-child(3) a:before {
  content: "";
  position: absolute;
  box-sizing: border-box;
  width: 1.45em;
  height: 1.1em;
  margin-top: -0.25em;
  margin-right: -0.2em;
  background: 
    conic-gradient(from 45deg at 50% 65%, #fff0 0 75%, var(--icon) 0 100%), 
    conic-gradient(from 45deg at 50% 83%, var(--icon) 0 75%, #fff0 0 100%);
}

ul li + li a:after { display: none; }


ul li:hover {
  --clr: #4d4376;
  transition: var(--tra);
}

ul li a span {
  margin-left: 0;
}

ul li a:hover span {
  margin-left: calc(100% - 5em);
  transition: var(--tra);
}
ul li:nth-child(2) a:hover span {
  margin-left: calc(100% - 5.15em);
}
ul li:nth-child(3) a:hover span {
  margin-left: calc(100% - 6em);
}

.area::after {
  width: 100%;.........完整代码请登录后点击上方下载按钮下载查看