HTML/CSS - sololearn clone Online Editor and JavaScript Compiler

html

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<body>
     <script> function show(shown, hidden) { document.getElementById(shown).style.display='block'; document.getElementById(hidden).style.display='none'; return false; } </script> </head> <body> <div id="Page1">
<nav class="nav">
  <a href="#" class="nav__link">
    <i class="material-icons nav__icon">school</i>
    <span class="nav__text">Dashboard</span>
  </a>
  <a href="#" class="nav__link" onclick="return show('Page2','Page1');">
    <i class="material-icons nav__icon">flash_on</i>
    <span class="nav__text">Community</span>
  </a>
  <a href="#" class="nav__link nav__link--active">
    <i class="material-icons nav__icon">home</i>
    <span class="nav__text">Feed</span>
  </a>
  <a href="#" class="nav__link">
    <i class="material-icons nav__icon">code</i>
    <span class="nav__text">Code</span>
  </a>
  <a href="#" class="nav__link">
    <i class="material-icons nav__icon">chat_bubble</i>
    <span class="nav__text">Discuss</span>

css

body {
    margin: 0 0 55px 0;
}
.nav {
    position: fixed;
    bottom: 0;
    width: 100%;
    height: 55px;
    box-shadow: 0 0 3px rgba(0, 0, 0, 0.2);
    background-color: white;
    display: flex;
    overflow-x: auto;""
}
#topicon {
 font-size:25px;   
 margin-top:auto;
 margin-bottom:auto;
    
}
.nav__link {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
    min-width: 50px;
    overflow: hidden;

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