css实现自适应左侧粘性伸缩菜单效果代码-html代码-BFW代码库

代码语言：html

代码描述：css实现自适应左侧粘性伸缩菜单效果代码

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">
  

  
  <link rel='stylesheet' href='https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&amp;display=swap'>
<link rel='stylesheet' href='https://fonts.googleapis.com/css2?family=Material+Icons+Round'>
  
<style>

:root {
    --primary: 237, 94%, 81%;
    --background: 266, 16%, 92%;
    --background-secondary: 256, 12%, 12%;
    --background-secondary-dark: 256, 10%, 10%;
    --background-secondary-light: 257, 11%, 16%;
    --text-primary: 0, 0%, 0%;
    /* Colors */
    --black: 0, 0%, 0%;
    --white: 0, 0%, 100%;
    --quite-gray: 0, 0%, 50%;
    --grooble: 10, 28%, 93%;
    /* Sizes */
    --heading-large: 5.6rem;
    --heading-medium: 3.6rem;
    --heading-small: 2.4rem;
    --paragraph: 1.11rem;
    --navbar-buttons: 2.4rem;
    /* misc */
    --transition-main: .175, .685, .32;
    /* Fonts */
    --font-main: "Poppins";
}

/* ===========
    Variabels
   =========== */

/* ===============
    Global Styles
   =============== */

*, *::before, *::after {
    box-sizing: inherit;
}
html, body {
    margin: 0;
    width: 100%;
    color: hsl(var(--text-primary));
    font-family: var(--font-main);
    background-color: hsl(var(--background));
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
    box-sizing: border-box;
}

/* ============
    Typography
   ============ */

/* Headings */
h1, h2, h3, h4, h5, h6 {
    margin: 0;
}
/* Font Size */
h1 {
    font-size: var(--heading-large);
}
h2 {
    font-size: var(--heading-medium);
}
h3 {
    font-size: var(--heading-small);
}
h4 {
    font-size: calc(var(--heading-small) - .2rem);
}
h5 {
    font-size: calc(var(--heading-small) - .4rem);
}
h6 {
    font-size: calc(var(--heading-small) - .6rem);
}
/* Font Weight */
h1, h2 {
    font-weight: 900;
}
h3, h4, h5, h6 {
    font-weight: 800;
}
/* Paragraphs */
p {
    margin: 0;
    font-size: var(--paragraph);
}
/* Links */
a {
    color: hsla(var(--primary), 1);
    font-size: var(--paragraph);
    text-decoration: underline;
}
a:visited {
    color: hsla(var(--primary), .5);
}

/* =========
    Buttons
   ========= */

button {
    padding: .8em 1.2em;
    border: 1px solid hsl(var(--black));
    background-color: hsl(var(--background));
    font-size: var(--paragraph);
    cursor: pointer;
    outline: none;
}
button:focus {
    box-shadow:
            0 0 0 2px hsl(var(--black)),
            0 0 0 3px hsl(var(--white));
    border: 1px solid transparent;
}

/* =======
    Lists
   ======= */

ul, ol {
    margin: 1em 0;
}

/* =======
    Forms
   ======= */

form {
    margin: 0;
}
fieldset {
    margin: 0;
    padding: .5em 0;
    border: none;
}
input {
    padding: .8em 1.2em;
    font-size: var(--paragraph);
    background-color: hsl(var(--grooble));
    border: 2px solid hsl(var(--grooble));
    outline: none;
}
textarea {
    padding: .8em 1.2em;
    font-size: var(--paragraph);
    font-family: var(--font-main);
    background-color: hsl(var(--grooble));
    border: 2px solid hsl(var(--grooble));
    outline: none;
}
input, textarea {
    transition: all .2s ease-in-out;
}
input:hover, input:focus, textarea:hover, textarea:focus {
    box-shadow:
            0 0 0 2px hsl(var(--black)),
            0 0 0 3px hsl(var(--white));
    border: 2px solid transparent;
}
select {
    padding: .8em 1.2em;
    border: 1px solid hsl(var(--black));
    font-size: var(--paragraph);
    outline: none;
}

/* =========
    Classes
   ========= */

/* ================
    Global classes
   ================ */

/* =========
    Flexbox
   ========= */

.flexbox {
    display: flex;
    justify-content: center;
    align-items: center;
}
.flexbox-left {
    display: flex;
    justify-content: flex-start;
    align-items: center;
}
.flexbox-right {
    display: flex;
    justify-content: flex-end;
    align-items: center;
}
/* Columns */
.flexbox-col {
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
}
.flexbox-col-left {
    display: flex;
    justify-content: flex-start;
    flex-direction: column;
    align-items: flex-start;
}
.flexbox-col-left-ns {
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: flex-start;
}
.flexbox-col-right {
    display: flex;
    justify-content: flex-end;
    flex-direction: column;
    align-items: flex-end;
}
.flexbox-col-start-center {
    display: flex;
    justify-content: flex-start;
    flex-direction: column;
    align-items: center;
}
/* Spacings */
.flexbox-space-bet {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* =========
    Classes
   ========= */

.view-width {
    width: 70%;
}

/* ========
    Navbar
   ======== */

#navbar {
    top: 0;
    padding: 0;
    width: 5em;
    height: 100vh;
    position: fixed;
    background-color: hsl(var(--background-secondary));
    transition: width .35s cubic-bezier(var(--transition-main), 1);
    overflow-y: auto;
    overflow-x: hidden;
}
#navbar:hover {
    width: 16em;
}
#navbar::-webkit-scrollbar-track {
    background-color: hsl(var(--background-secondary));
}
#navbar::-webkit-scrollbar {
    width: 8px;
    background-color: hsl(var(--background-secondary));
}
#navbar::-webkit-scrollbar-thumb {
    background-color: hsl(var(--primary));
}
.navbar-items {
    margin: 0;
    padding: 0;
    list-style-type: none;
}
/* Navbar Logo */
.navbar-logo {
    margin: 0 0 2em 0;
    width: 100%;
    height: 5em;
    background: hsl(var(--background-secondary-dark));
}
.navbar-logo > .navbar-item-inner {
    width: calc(5rem - 8px);
}
.navbar-logo > .navbar-item-inner:hover {
    background-color: transparent;
}
.navbar-logo > .navbar-item-inner > svg {
    height: 2em;
    fill: hsl(var(--white));
}
/* Navbar Items */
.navbar-item {
    padding: 0 .5em;
    width: 100%;
    cursor: pointer;
}
.navbar-item-inner {
    padding: 1em 0;
    width: 100%;
    position: relative;
    color: hsl(var(--quite-gray));
    border-radius: .25em;
    text-decoration: none;
    transition: all .2s cubic-bezier(var(--transition-main), 1);
}
.navbar-item-inner:hover {
    color: hsl(var(--white));
    background: hsl(var(--background-secondary-light));
    box-shadow: 0 17px 30px -10px hsla(var(--black), .25);
}
.navbar-item-inner-icon-wrapper {
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