css实现悬浮选择框效果代码-html代码-BFW代码库

代码语言：html
代码描述：css实现悬浮选择框效果代码
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
<html>
<head>
    <style>
        *, *:before, *:after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html, body {
            font-size: 62.5%;
            height: 100%;
        }
@media (max-width: 768px) {
            html, body {
                font-size: 50%;
            }
        }

        body {
            background: #7B00FF;
        }

        .demo {
            position: absolute;
            top: 50%;
            left: 50%;
            margin-left: -18rem;
            margin-top: -25rem;
            width: 36rem;
            height: 50rem;
            padding-top: 22rem;
            background: #FFFFFF;
            box-shadow: 0 0.5rem 5rem rgba(0, 0, 0, 0.4);
            font-family: "Open Sans", Helvetica, Arial, sans-serif;
        }
        .demo__content {
            position: relative;
            height: 100%;
        }
        .demo__heading {
            font-size: 2.2rem;
            line-height: 7rem;
            padding-left: 3rem;
            color: #313131;
        }
        .demo__elems {
            position: relative;
            height: 21rem;
        }
        .demo__elem {
            position: relative;
            height: 7rem;
            font-size: 1.8rem;
            line-height: 7rem;
            padding-left: 3rem;
            border-top: 1px solid #e7e7e7;
        }
        .demo__hover {
            z-index: 2;
            position: absolute;
            left: 0;
            width: 100%;
            height: 7rem;
            cursor: pointer;
        }
        .demo__hover-1 {
            top: 0;
        }
        .demo__hover-1:hover ~ .demo__highlighter {
            transform: translateY(0);
        }
        .demo__hover-1:hover ~ .demo__highlighter .demo__elems {
            transform: translateY(0);
        }
        .demo__hover-2 {
            top: 7rem;
        }
        .demo__hover-2:hover ~ .demo__highlighter {
            transform: translateY(7rem);
        }
        .demo__hover-2:hover ~ .demo__highlighter .demo__elems {
            transform: translateY(-7rem);
        }
        .demo__hover-2:hover ~ .demo__examples .example-adv__top,
        .demo__hover-2:hover ~ .demo__examples .example-adv__mid,
        .demo__hover-2:hover ~ .demo__examples .example-adv__line {
            transform: translateY(100%);
            opacity: 0;
            transition: transform 0.2s, opacity 0.2s;
        }
        .demo__hover-2:hover ~ .demo__examples .example-web__top,
        .demo__hover-2:hover ~ .demo__examples .example-web__left {
            transform: scale(1);
            opacity: 1;
            transition: transform 0.4s 0.2s, opacity 0.4s 0.2s;
        }
        .demo__hover-2:hover ~ .demo__examples .example-web__right-line {
            transform: scale(1);
        }
        .demo__hover-2:hover ~ .demo__examples .example-web__right-line:nth-child(1) {
            transition: transform 0.4s 0s;
        }
        .demo__hover-2:hover ~ .demo__examples .example-web__right-line:nth-child(2) {
            transition: transform 0.4s 0.06s;
        }
        .demo__hover-2:hover ~ .demo__examples .example-web__right-line:nth-child(3) {
            transition: transform 0.4s 0.12s;
        }
        .demo__hover-2:hover ~ .demo__examples .example-web__right-line:nth-child(4) {
            transition: transform 0.4s 0.18s;
        }
        .demo__hover-2:hover ~ .demo__examples .example-web__right-line:nth-child(5) {
            transition: transform 0.4s 0.24s;
        }
        .demo__hover-2:hover ~ .demo__examples .example-web__right-line:nth-child(6) {
            transition: transform 0.4s 0.3s;
        }
        .demo__hover-3 {
            top: 14rem;
        }
        .demo__hover-3:hover ~ .demo__highlighter {
            transform: translateY(14rem);
        }
        .demo__hover-3:hover ~ .demo__highlighter .demo__elems {
            transform: translateY(-14rem);
        }
        .demo__hover-3:hover ~ .demo__examples .example-adv__top,
        .demo__hover-3:hover ~ .demo__examples .example-adv__mid,
        .demo__hover-3:hover ~ .demo__examples .example-adv__line {
            transform: translateY(100%);
            opacity: 0;
            transition: transform 0.2s, opacity 0.2s;
        }
        .demo__hover-3:hover ~ .demo__examples .example-both {
            background: #39A5F7;
            transition: background-color 0.4s 0.2s;
        }
        .demo__hover-3:hover ~ .demo__examples .example-both__half {
            opacity: 1;
            transform: scale(1);
            transition: transform 0.4s 0.2s, opacity 0.4s 0.2s;
        }
        .demo__highlighter {
            z-index: 1;
            position: absolute;
            top: 0;
            left: -1rem;
            width: 38rem;
            height: 7rem;
            background: #39A5F7;
            overflow: hidden;
            box-shadow: 0 0.3rem 0.2rem rgba(0, 0, 0, 0.3);
            transition: transform 0.5s cubic-bezier(0.59, 0.04, 0.3, 1.43);
        }
        .demo__highlighter .demo__elems {
            position: absolute;
            top: 0;
            left: 1rem;
            transition: transform 0.5s cubic-bezier(0.59, 0.04, 0.3, 1.43);
        }
        .demo__highlighter .demo__elem {
            color: #fff;
            border: none;
        }
        .demo__examples {
            position: absolute;
            top: -29rem;
            left: 0;
            width: 100%;
            height: 22rem;
            padding: 5.5rem 7rem 0 7rem;
        }
        .demo__examples-nb {
            position: relative;
            height: 13.5rem;
            padding: 0 1.5rem;
            border-bottom: 1rem solid #424242;
        }

        .nb-inner {
            position: relative;
            width: 100%;
            height: 12.5rem;
            border: 0.7rem solid #424242;
            overflow: hidden;
        }

        .example {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }
        .example-adv__top {
            height: 2rem;
            background: #EFEFEF;
            padding: 0.5rem 2rem;
            margin-bottom: 2rem;
            transition: transform 0.4s 0.2s, opacity 0.4s 0.2s;
        }
        .example-adv__top-search {
            position: relative;
            height: 100%;
            background: #fff;
        }
        .example-adv__top-search:after {
            content: "";
            position: absolute;
            top: 0;
            right: 0;
            width: 2.5rem;
            height: 100%;
            background: #02ADF6;
        }
        .example-adv__mid {
            position: relative;
            width: 13.6rem;
            height: 3.5rem;
            background: #FFF7BD;
            margin: 0 auto 0.7rem;
            transition: transform 0.4s 0.2s, opacity 0.4s 0.2s;
        }
        .example-adv__mid:before, .example-adv__mid:after {
            content: "";
            position: absolute;
            left: 1rem;
            height: 0.7rem;
        }
        .example-adv__mid:before {
            top: 0.6rem;
            width: 9rem;
            background: #02ADF6;
        }
        .example-adv__mid:after {
            bottom: 0.6rem;
            width: 11.6rem;
            background: #fff;
        }
        .example-adv__line {
            height: 0.5rem;
            background: #EFEFEF;
            width: 6.8rem;
            margin-left: 2rem;
            margin-bottom: 0.7rem;
            transition: transform 0.4s 0.2s, opacity 0.4s 0.2s;
        }
        .example-adv__line.long {
            width: 13.6rem;
        }
        .example-web {
            padding: 1.5rem 2rem 0;
            font-size: 0;
        }
        .example-web__top {
            background: #EF4239;
            width: 100%;
            height: 1.5rem;
            margin-bottom: 0.5rem;
            transition: transform 0.2s;
            transform: translateY(-5rem);
        }
        .example-web__left {
            display: inline-block;
            width: 6.5rem;
            height: 7rem;
            background: #C6C6C6;
            margin-right: 0.6rem;
            transition: transform 0.2s, opacity 0.2s;
            transform: scale(0.7);
            opacity: 0;
        }
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