paper looking css

body {
    font-family: 'Lucida Grande', 'Lucida Sans Unicode', arial, sans-serif;
    background: #dfe6e9;
}

#layout {
    display: flex;
    margin: 0 auto;
}

#menu {
    width: 15%;
    margin: 60px 5px;
    overflow: auto;
}

#menu p {
    margin: 0;
}

#menu>p {
    font-weight: bold;
    font-size: 110%;
}

#menu ul {
    padding-left: 20px;
}


#main {
    width: 80%;
    max-width: 1200px;
    position: relative;
    background: #fff;
    margin: 60px auto;
    box-shadow: 0px 2px 38px rgba(0, 0, 0, 0.2);
    padding: 25px;
    overflow: auto;
}


#parentLink {
    float: right;
    margin-top: 20px;
}

#title {
    margin: 0;
    padding-top: 10px;
}

img {
    max-width: 100%;
}

pre {
    white-space: pre-wrap;
    word-wrap: anywhere;
}

iframe.pdf-view {
    width: 100%;
    height: 800px;
}

#toggleMenuButton {
    display: none;
    position: fixed;
    top: 8px;
    left: 5px;
    width: 1.4em;
    border-radius: 5px;
    border: 1px solid #aaa;
    font-size: 2rem;
    z-index: 10;
    height: auto;
    color: black;
    cursor: pointer;
}

#childLinks.grid ul {
    list-style-type: none;
    display: flex;
    flex-wrap: wrap;
    padding: 0;
}

#childLinks.grid ul li {
    width: 180px;
    height: 140px;
    padding: 10px;
}

#childLinks.grid ul li a {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    border: 1px solid #ddd;
    border-radius: 5px;
    justify-content: center;
    align-content: center;
    text-align: center;
    font-size: large;
}

#childLinks.grid ul li a:hover {
    background: #eee;
}

#childLinks.list ul {
    list-style-type: none;
    display: inline-flex;
    flex-wrap: wrap;
    padding: 0;
    margin-top: 5px;
}

#childLinks.list ul li {
    margin-right: 20px;
}

#noteClippedFrom {
    padding: 10px 0 10px 0;
    margin: 20px 0 20px 0;
    color: #666;
    border: 1px solid #ddd;
    border-left: 0;
    border-right: 0;
}

#toggleMenuButton::after {
    position: relative;
    top: -2px;
    left: 1px;
}

@media (max-width: 48em) {
    #layout.showMenu #menu {
        display: block;
        margin-top: 40px;
    }

    #toggleMenuButton {
        display: block;
    }

    #layout.showMenu #main {
        display: none;
    }

    #title {
        padding-left: 60px;
    }

    #layout.showMenu #toggleMenuButton::after {
        content: "«";
    }

    #toggleMenuButton::after {
        content: "»";
    }

    #menu {
        display: none;
    }
}