* {
    margin: 0;
    padding: 0;
}

header {
    width: 100%;
    height: 80px;
    text-align: center;
}

header ul {
    list-style-type: none;
    background-color: #333;
}

header ul li {
    display: inline-block;
    height: 100%;
}

header ul li a {
    text-decoration: none;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    line-height: 80px;
}

#content {
    width: 100%;
    margin-top: 40px;
    margin-bottom: 40px;
    background-color: #333;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
}

#content > img  {
    height: 250px;
    width: calc(033.3333333%-20px);
    padding: 20px;
}

footer {
    height: 50px;
    background-color: #333;
    text-align: center;
}

footer p {
    color: #fff;
    line-height: 50px;
    font-size: 1.5em;
}