css实现悬浮下拉菜单效果代码-html代码-BFW代码库

代码语言：html
代码描述：css实现悬浮下拉菜单效果代码
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<html>

<head>

    <style>
        :root {
            --menu-width: 37.5em; /* Width of menu */
            --items: 4; /* Number of items you have */
            --item-width: calc(var(--menu-width) / var(--items));
        }
        
        body {
            margin: 0;
            padding: 0;
            background: linear-gradient(45deg, #102eff, #d2379b);
            font-family: 'Roboto', sans-serif;
            height: 100vh;
            overflow: hidden;
            width: 100vw;
        }
        
        nav {
            width: var(--menu-width);
            display: flex;
            transform-style: preserve-3d;
            justify-content: space-evenly;
            position: relative;
            z-index: 2;
            margin: 0px auto;
            perspective: 2000px;
            flex-wrap: wrap;
            top: 3em;
        }
        
        nav .menu-item {
            color: white;
            font-weight: 600;
            transform-style: preserve-3d;
            flex-grow: 1;
            display: flex;
            flex-basis: var(--item-width);
            box-sizing: border-box;
            padding: 1em 1.5em;
            justify-content: center;
            perspective: 200px;
            letter-spacing: 0.5px;
            min-height: 7.5em;
        }
        
        nav .menu-text, nav .menu-text a {
            font-size: 1em;
            color: white;
            text-decoration: none;
            text-shadow: 0 1px 5px rgba(0,0,0,0.1);
            transition: color 0.1s ease-out;
            text-align: center;
        }
        
        nav .menu-text a:hover {
            color: rgba(255,255,255,0.5);
        }
        
        #sub-menu-holder {
            pointer-events: none;
            color: rgba(0,0,0,0.5);
            font-weight: normal;
            padding: 1em;
            position: absolute;
            transition: opacity 2 ease-out;
            transform: rotateX(-25deg) scale(1);
            transform-origin: 50% 7em 0em;
            opacity: 0;
            box-shadow: 0 2px 7px rgba(0,0,0,0.1), 0 2px 20px rgba(0,0,0,0.3);
            box-sizing: border-box;
            top: 3rem;
            border-radius: 10px;
            background: white;
            display: block;
            height: 300px;
            width: calc(var(--menu-width) * 1.5);
        }
        
        #sub-menu-container {
            position: absolute;
            z-index: -1;
            min-width: 100%;
            top: 2.5em;
            width: 100%;
        }
        
        nav .menu-item:hover ~ #sub-menu-container #sub-menu-holder {
            animation: clipPath 0.25s ease-out 1 forwards;        
            transition: clip-path 0.25s ease-out, left 0.15s ease-out, height 0.15s ease-out;
            opacity: 1;
            right: auto;
        }
        nav .menu-item:nth-of-type(1):hover ~ #sub-menu-container #sub-menu-holder,
        nav .menu-item:nth-of-type(4):hover ~ #sub-menu-container #sub-menu-holder {
            clip-path: inset(0 28.75em 0 0 round 10px);
            height: 14em;
        }
        
        nav .menu-item:nth-of-type(2):hover ~ #sub-menu-container #sub-menu-holder,
        nav .menu-item:nth-of-type(3):hover ~ #sub-menu-container #sub-menu-holder {
            clip-path: inset(0 15em 0 0 round 10px);
        }
        
        nav .menu-item:nth-of-type(1):hover ~ #sub-menu-container #sub-menu-holder {
            left: calc(-9em + -1px);
        }
        nav .menu-item:nth-of-type(2):hover ~ #sub-menu-container #sub-menu-holder {
            left: calc(-6.5em + -1px);
            height: 18.75em;
        }
        nav .menu-item:nth-of-type(3):hover ~ #sub-menu-container #sub-menu-holder {
            left: calc(2.75em + 1px);
            height: 24.5em;
        }
        nav .menu-item:nth-of-type(4):hover ~ #sub-menu-container #sub-menu-holder {
            left: calc(19em + 1px);
        }
        
        .menu-item .sub-menu {
            position: absolute;
            top: 7em;
            color: rgba(0,0,0,0.5);
            border-radius: 10px;
            min-width: 27.5em;
            pointer-events: none;
            box-sizing: border-box;
            z-index: 999;
            margin-left: -5em;
            clip-path: inset(0 10em 10em 15em);
            opacity: 0;
            font-weight: initial;
            padding: 1.5em;
            transition: all 0.25s ease-out, opacity 0.25s ease-in, margin-left 0.25s ease-out, clip-path 0.15s ease-out;
        }
        
        .menu-item .sub-menu.double {
            min-width: 41.25em;
            height: 18.75em;
            display: grid;
            grid-template-columns: 54% 50%;
        }
        .menu-item .sub-menu.triple {
            min-width: 41.25em;
            height: 25em;
            display: grid;
            padding: 1.5em 2.5em;
            grid-template-columns: 55% 45%;
        }
        .menu-item:hover .sub-menu {
            pointer-events: all;
            clip-path: inset(0 0 0 0);
        }
        
        .menu-text:after {
            transition: bottom 0.25s ease-out, opacity 0.01s ease-out 0.01s;
            opacity: 0;
            content: '';
            position: absolute;
            pointer-events: none;
            bottom: -5em;
            left: calc(50% - 10px);
            border-color: transparent transparent white transparent;
            border-width: 10px;
            border-style: solid;
        }
        .menu-item:hover .menu-text:after {
            bottom: 0.5em;
            opacity: 1;
            transition: bottom 0.25s ease-out, opacity 0.01s ease-out 0.15s;
        }
        .menu-item:hover .sub-menu {
            opacity: 1;
            margin-left: 0;
        }
        
        .menu-item:hover ~ #sub-menu-container #sub-menu-holder  {
            transition: transform 0.25s ease-out, opacity 0.25s ease-out, clip-path 0.25s ease-out;
        }
        
        @keyframes clipPath {
            0% {
                opacity: 0;
            }
            100% {
                transform: rotateX(0deg) scale(1);
                top: 4.5em;
                opacity: 1;        
            }
        }
        
        /* Menu specific */
        .menu-item .title {
            font-weight: 500;
            color: rgb(44 70 86);
            margin: 0 0 0.25em 0;
        }
        
        .menu-item .icon-box * {
            transition: all 0.1s ease-out;
            position: relative;
        }
        .menu-item .icon-box.space {
            margin-bottom: 1.25em;
        }
        .menu-item .icon-box.flat {height: 1.5em;margin-bottom: 0.5em;}
        .menu-item .icon, .menu-item .text {
            float: left;
            color: #9ea9af;
        }
        
        .menu-item .icon {
            color: rgb(44 70 86);
            font-size: 1.25em;
            margin: 0 1em 0 0;
        }
        .menu-item .icon-box {
            cursor: pointer;
        }
        .menu-item .icon-box {
            float: left;
            width: 100%;
            margin: 0;
            height: 4em;
            row-gap: 0;
            line-height: 1em;
        }
        
        .menu-item .icon-box .text i {
            clip-path: inset(0 100% 0 0);
            font-size: 0.75em;
            position: relative;
            top: -1px;
        }
        
        /* Base Icon Style */
        .icon-box.gb .icon i:before {
            background: linear-gradient(45deg, #0c86ef, #0cef9b);
            -webkit-text-fill-color: transparent;
            -webkit-background-clip: text;
            padding-left: 1px;
        }
        
        /* Define Icon Colors */
        .icon-box.gb.a .icon i:before {background-image: linear-gradient(45deg, #2ca7ff 35%, #31d078 75%);}
        .icon-box.gb.b .icon i:before {background-image: linear-gradient(45deg, #f32b2b 35%, #efbe0c 75%);}
        .icon-box.gb.c .icon i:before {background-image: linear-gradient(45deg, #7176ff 35%, #b26cea 75%);}
        .icon-box.gb.d .icon i:before {background-image: linear-gradient(45deg, #79c76f 35%, #bed09b 75%);}
        .icon-box.gb.e .icon i:before {background-image: linear-gradient(45deg, #6082ff 35%, #ff5dbe 75%);}
        .icon-box.gb.f .icon i:before {background-image: linear-gradient(45deg, #808080 35%, #bbbbbb 75%);}
        
        .menu-item .icon-box:hover .text i {
            clip-path: inset(0 0 0 0);
            transition: clip-path 0.1s ease-out;
        }
        
        .menu-item .icon-box:hover .icon, .menu-item .icon-box:hover .title, .menu-item .icon-box:hover .sub-text {
            color: rgb(89 110 123);
        }
        
        #sub-menu-bottom {
            background: #d4e3ea70;
            position: absolute;
            bottom: 0;
            opacity: 0;
            transition: all 0.25s ease-out, height 0.1s ease-out;
            left: 0;
            width: 100%;
            height: 5em;
        }
        nav .menu-item:nth-of-type(3).highlight:hover ~ #sub-menu-container #sub-menu-holder #sub-menu-bottom {
            height: 7.5em;
        }
        .bottom-container {
            grid-area: 4 / -3 / 4 / 3;
            padding-top: 1.5em;
            color: #3a5260;
            font-weight: 500;
        }
        
        .top-container {
            grid-area: 1 / -3 / 1 / 3;
            margin: 0 0 2em 0;
        }
        
        .bottom-container a {
            float: right;
            background: linear-gradient(90deg, #8ea4b166, #a3b5bf6b);
            padding: 0.5em 1em;
            border-radius: 100px;
            position: absolute;
            color: #2c4655bf;
            font-weight: bold;
            text-decoration: none;
            right: 1.5em;
            bottom: 1.5em;
        }
        
        .bottom-container a:hover {
            background: linear-gradient(90deg, #8ea4b136, #a3b5bf33);
        }
        
        .sub-menu h3 {
            font-size: 1em;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: rgb(44 70 86 / 68%);
            margin: 0.75em 0;
        }
        
        .sub-menu .box a {
            width: 100%;
            float: left;
            font-size: 1em;
            line-height: 1.75em;
            color: #7a8a94;
            text-decoration: none;
        }
        
        .sub-menu .box a:hover {
            color: rgb(44 70 86);
        }
        
        .box {
            margin: 0 0 3em 0;
        }
        
        .icon.big i {
            font-size: 1.25em;
            top: 0.2em;
        }
        nav .menu-item.highlight:hover ~ #sub-menu-container #sub-menu-holder #sub-menu-bottom { opacity: 1; }
    </style>
  
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