food.css

html, body {
    font-family: 'Gill Sans', 'Gill Sans MT', 'Open Sans', sans-serif;
    height: 100%;
    width: 100%;
    padding: 0;
    margin: 0;
    overflow: hidden;
}

h1 {
    margin: 0;
    font-weight: 600;
}

header {
    background-color: #000;
    color: white;
    z-index: 1;
    border-bottom: solid 2px lime;
    padding: 12px 22px 16px 22px;
}

#logo {
    width: 238px;
    height: 30px;
    float: right;
    border-style: none;
    margin-top: 8px;
}

#recipe {
    float: left;
}

.background {
    background-image: url('background.jpg');
    background-size: cover;
    height: 100%;
    padding: 0;
}

.background::after {
    content: "";
    background-color: #000;
    width: 100%;
    height: 100%;
    position: relative;

    opacity: 0.8;
    display: block;
    z-index: 0;
}

.content {
    color: white;
    z-index: 100;
    position: absolute;
    top: 68px;
}

#side-bar {
    background-image: url('navigation-map.png');
    height: 710px;
    width: 345px;
    float: left;
    position: relative;
}

.nav-0 {
    background-position: 0px -20px;
}

.nav-1 {
    background-position: -364px -20px;
}

.nav-2 {
    background-position: -732px -20px;
}

.page-wrapper {
    width: 1090px;
    white-space: nowrap;
    overflow-y: scroll;
}

.page {
    font-size: 34px;
    line-height: 48px;
    display: none;
}

.active {
    display: block;
}