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

body {
    background-color: #d9dcd6;
}

/* I removed the class '.' from the header class and now it's an element. */
header {
    padding: 20px;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    background-color: #2a607c;
    color: #ffffff;
}

header h1 {
    display: inline-block;
    font-size: 48px;
}

header h1 .seo {
    color: #d9dcd6;
}

header nav {
    padding-top: 15px;
    margin-right: 20px;
    float: right;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    font-size: 20px;
}

header nav ul {
    list-style-type: none;
}

header nav ul li {
    display: inline-block;
    margin-left: 25px;
}

a {
    color: #ffffff;
    text-decoration: none;
}

p {
    font-size: 16px;
}

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

/* These classes affect the position of the images in the section element. */
.float-left {
    float: left;
    margin-right: 25px;
}

.float-right {
    float: right;
    margin-left: 25px;
}

/* Removed the content class and renamed it to main. */
main {
    width: 75%;
    display: inline-block;
    margin-left: 20px;
}

/* Removed the serch-engine-optimization class with section element to follow semantic code. */
/* Removing redundancy classes below, in the section element to follow semantic code. */
section {
    margin-bottom: 20px;
    padding: 50px;
    height: 300px;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    background-color: #0072bb;
    color: #ffffff;
}

/* Removing redundancy in the cestion element to follow semantic code. */
section img{
    max-height: 200px;
}

/* Removing redundancy in the cestion element to follow semantic code. */
section h2{
    margin-bottom: 20px;
    font-size: 36px;
}

/* Updating the benefits class with the aside elemnt. */
/* Updating the padding to 45px to be in line with the desktop version of the demo.png. */
aside {
    margin-right: 20px;
    padding: 45px;
    clear: both;
    float: right;
    width: 20%;
    height: 100%;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    background-color: #2589bd;
}

/* Remiving the benefit class with the div element for semantic code symmetry. */
/* Removing redundancy in the benefit class into one group for each element and child element; semantic code.  */
div {
    margin-bottom: 32px;
    color: #ffffff;
}

/* Remiving the benefit class with the div element for semantic code symmetry. */
/* Removing redundancy in the benefit class into one group for each element and child element; semantic code.  */
div h3 {
    margin-bottom: 10px;
    text-align: center;
}

/* Remiving the benefit class with the div element for semantic code symmetry. */
/* Removing redundancy in the benefit class into one group for each element and child element; semantic code.  */
div img {
    display: block;
    margin: 10px auto;
    max-width: 150px;
}

/* Replacing the footer div class with the footer element for semantic code. */
/* Hiding the footer element information to match the homework-demo image. */
footer {
    visibility: hidden;
    padding: 30px;
    clear: both;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    text-align: center;
}

/* Replacing the footer div class with the footer element for semantic code. */
/* Hiding the footer header class information to match the homework-demo image. */
footer h2 {
    visibility: hidden;
    font-size: 20px;
}