* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            font-family: Arial, Helvetica, sans-serif;
            font-size: 16px;
        }

        body {
            min-height: 100vh;
        }

        main {
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem;
            width: 100vw;
            height: 48px;
            position: fixed;
            top: 0;
            border-bottom: 1px solid #fff;
            z-index: 2;
            background-color: #000;
            color: #fff;
        }

        section {
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 100vw;
            height: 100vh;
            z-index: 1;
            padding-top: 48px;
        }

        .view1 {
            display: flex;
            flex-direction: row;
            flex-wrap: wrap;
            justify-content: space-evenly;
            background-color: lightgray;
            color: #000;
        }

        .view1 > div {
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 100px;
            height: 100px;
            background-color: #000;
            color: #fff;
            margin: 10px;
        }

        .view2 {
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            display: none;
            background-color: darkblue;
            color: #fff;
        }