css3實現側邊滑動選單

這是一個用css3實現的一個側邊滑動選單，下面是效果圖

廢話不多說，貼程式碼

HTML程式碼

<nav class="accordion arrows">
        <header class="box">
            <label for="acc-close" class="box-title">主選單</label>
        </header>
        <input type="radio" name="accordion" id="cb1">
        <section class="box">
            <label for="cb1" class="box-title">one</label>
            <label for="acc-close" class="box-close"></label>
            <div class="box-content">Click on an item to open. Click on its header or the list header to close.</div>
        </section>
        <input type="radio" name="accordion" id="cb2">
        <section class="box">
            <label for="cb2" class="box-title">tow</label>
            <label for="acc-close" class="box-close"></label>
            <div class="box-content">Add the class 'arrows' to nav.accordion to add dropdown arrows.</div>
        </section>
        <input type="radio" name="accordion" id="cb3">
        <section class="box">
            <label for="cb3" class="box-title">three</label>
            <label for="acc-close" class="box-close"></label>
            <div class="box-content">Vestibulum ante ipsum primis in faucibus orci luctus etultrices posuere cubilia Curae.</div>
        </section>
        <input type="radio" name="accordion" id="acc-close">
    </nav>
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CSS

body {
        height: calc(100% - 20px);
        width: calc(100% - 20px);
        margin: 0;
        padding: 10px;
        display: #f2f2f2;
        color: rgba(0, 0, 0, .87);
        font-family: 'Roboto', sans-serif;
    }
    .accordion {
        margin: auto;
        width: 400px;
    }
    .accordion input {
        display: none;
    }
    .box {
        position: relative;
        background: white;
        height: 64px;
        transition: all .15s ease-in-out;
    }
    .box::before {
        content: '';
        position: absolute;
        display: block;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        pointer-events: none;
        box-shadow: 0 -1px 0 #e5e5e5,0 0 2px rgba(0,0,0,.12),0 2px 4px rgba(0,0,0,.24);
    }
    header.box {
        background: #00BCD4;
        z-index: 100;
        cursor: initial;
        box-shadow: 0 -1px 0 #e5e5e5,0 0 2px -2px rgba(0,0,0,.12),0 2px 4px -4px rgba(0,0,0,.24);
    }
    header .box-title {
        margin: 0;
        font-weight: normal;
        font-size: 16pt;
        color: white;
        cursor: initial;
    }
    .box-title {
        width: calc(100% - 40px);
        height: 64px;
        line-height: 64px;
        padding: 0 20px;
        display: inline-block;
        cursor: pointer;
        -webkit-touch-callout: none;
        -webkit-user-select: none;
        -khtml-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
    }
    .box-content {
        width: calc(100% - 40px);
        padding: 30px 20px;
        font-size: 11pt;
        color: rgba(0,0,0,.54);
        display: none;
    }
    .box-close {
        position: absolute;
        height: 64px;
        width: 100%;
        top: 0;
        left: 0;
        cursor: pointer;
        display: none;
    }
    input:checked + .box {
        height: auto;
        margin: 16px 0;
        box-shadow: 0 0 6px rgba(0,0,0,.16),0 6px 12px rgba(0,0,0,.32);
    }
    input:checked + .box .box-title {
        border-bottom: 1px solid rgba(0,0,0,.18);
    }
    input:checked + .box .box-title {
        border-bottom: 1px solid rgba(0,0,0,.18);
    }
    input:checked + .box .box-content,
    input:checked + .box .box-close {
        display: inline-block;
    }
    .arrows section .box-title {
        padding-left: 44px;
        width: calc(100% - 64px);
    }
    .arrows section .box-title:before {
        position: absolute;
        display: block;
        content: '\203a';
        font-size: 18pt;
        left: 20px;
        top: -2px;
        transition: transform .15s ease-in-out;
        color: rgba(0,0,0,.54);
    }
    input:checked + section.box .box-title:before {
        transform: rotate(90deg);
    }
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