* {
    /* The width and height contains the content, padding and border */
    box-sizing: border-box;
    /* Box Model */
    padding: 0;
    margin: 0;
}

body {
    background-color: #d9dcd6;
}

/* header */
.header {
    /* Box Model */
    padding: 20px;
    /* Other */
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    background-color: #2a607c;
    color: #ffffff;
}

/* Heading of header */
.header h1 {
    /* Display and Font Size */
    display: inline-block;
    font-size: 48px;
}

/* span element in the heading of the header */
.header h1 .seo {
    color: #d9dcd6;
}

/* nav element */
.header nav {
    /* Box Model */
    padding-top: 15px;
    margin-right: 20px;
    /* Element floats to the right of its container */
    float: right;
    /* Other */
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    font-size: 20px;
}

/* Header's unordered list */
.header nav ul {
    list-style-type: none;
}

/* Header's list items of unordered list */
.header nav ul li {
    /* Display and Box Model */
    display: inline-block;
    margin-left: 25px;
}

/* Anchors */
a {
    color: #ffffff;
    /* Deactivate decoration added to text */
    text-decoration: none;
}

/* Paragraphs */
p {
    font-size: 16px;
}

/* Hero section */
.hero {
    /* Box Model */
    height: 800px;
    width: 100%;
    margin-bottom: 25px;
    /* Other */
    background-image: url("../images/digital-marketing-meeting.jpg");
    background-size: cover;
    background-position: center;
}

/* Left aligned elements */
.float-left {
    /* Element floats to the left of its container */
    float: left;
    /* Box Model */
    margin-right: 25px;
}

/* Right aligned elements */
.float-right {
    /* Element floats to the right of its container */
    float: right;
    /* Box Model */
    margin-left: 25px;
}

/* Content section */
.content {
    /* Display and Box Model */
    width: 75%;
    display: inline-block;
    margin-left: 20px;
}

/* Aside */
.benefits {
    /* Box Model */
    margin-right: 20px;
    padding: 20px;
    width: 20%;
    height: 100%;
    /* To push the element below both left and right floated elements */
    clear: both;
    /* Element floats to the right of its container */
    float: right;
    /* Other */
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    background-color: #165D83;
}

/* Articles in aside */
.benefit-lead,
.benefit-brand,
.benefit-cost {
    /* Box Model */
    margin-bottom: 32px;
    color: #ffffff;
}

/* Headings of aside articles */
.benefit-lead h3,
.benefit-brand h3,
.benefit-cost h3 {
    /* Box Model */
    margin-bottom: 10px;
    /* Centers the text */
    text-align: center;
}

/* Images in aside */
.benefit-lead img,
.benefit-brand img,
.benefit-cost img {
    /* Display and Box Model */
    display: block;
    margin: 10px auto;
    max-width: 150px;
}

/* Articles in the content section */
.search-engine-optimization,
.online-reputation-management,
.social-media-marketing {
    /* Box Model */
    margin-bottom: 20px;
    padding: 50px;
    height: 300px;
    /* Other */
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    background-color: #0072bb;
    color: #ffffff;
}

/* Images in the content section articles */
.search-engine-optimization img,
.online-reputation-management img,
.social-media-marketing img {
    /* Box Model */
    max-height: 200px;
}

/* Content section article headings */
.search-engine-optimization h2,
.online-reputation-management h2,
.social-media-marketing h2 {
    /* Box Model */
    margin-bottom: 20px;
    font-size: 36px;
}

/* Footer */
.footer {
    /* Box Model */
    padding: 30px;
    clear: both;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    /* Centers the text */
    text-align: center;
    font-size: inherit;
}

/* Heading of the footer */
.footer h4 {
    font-size: 20px;
}

/* Cancel the effect of the small element on font size */
.footer p small {
    font-size: inherit;
}