html {
  font-size: 12px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

html {
  position: relative;
  min-height: 100%;
}


#logo {
    position: absolute;
    right: 10px;
    bottom: 10px;
}

.my_div {
    padding: 10px;
    
}

body {
    margin: 0;
    padding: 0;
    font-size: 15px;
    font-family: "Lucida Grande", "Helvetica Nueue", Arial, sans-serif;
    margin-bottom: 30px;
}
nav {
    background-color: #333;
    border: 1px solid #333;
    color: #fff;
    display: block;
    margin: 0;
    overflow: hidden;
}

    nav ul {
        margin: 0;
        padding: 0;
        list-style: none;
    }

        nav ul li {
            margin: 0;
            display: inline-block;
            list-style-type: none;
            transition: all 0.2s;
        }

    nav > ul > li > a {
        color: #aaa;
        display: block;
        line-height: 2em;
        padding: 0.5em 2em;
        text-decoration: none;
    }

    nav li > ul {
        display: none;
        margin-top: 1px;
        background-color: #bbb;
    }

        nav li > ul li {
            display: block;
        }

            nav li > ul li a {
                color: #111;
                display: block;
                line-height: 2em;
                padding: 0.5em 2em;
                text-decoration: none;
            }

    nav li:hover {
        background-color: #666;
    }

        nav li:hover > ul {
            position: absolute;
            display: block;
        }

    nav li > ul > li ul {
        display: none;
        background-color: #888;
    }

    nav li > ul > li:hover > ul {
        position: absolute;
        display: block;
        margin-left: 100%;
        margin-top: -3em;
    }

    nav ul > li.sub {
        background: url(ic_keyboard_arrow_down_white_18dp.png) right center no-repeat;
    }

        nav ul > li.sub li.sub {
            background: url(ic_keyboard_arrow_right_white_18dp.png) right center no-repeat;
        }