body {
    background-color: aliceblue;
}

h1, h2, h3 {
    margin: 10px 20px;
    text-align: center;
}

header {
    height: 372px;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 10px 0px;
    overflow: hidden;
    background-color: aqua;
}

nav ul li {
    display: inline;
    text-decoration: none;
}

nav ul li a {
    text-align: center;
    padding: 20px;
    text-decoration: inherit;
    color: darkblue;
}

nav ul li a:hover {
    background-color: aquamarine;
}

p {
    margin: 0 20px;
    padding: 10px 0;
    text-indent: 2em;
}

#container {
    margin: 15px auto;
    padding: 0;
    width: 960px; 
    border: 10px solid cadetblue;
}

.imagebox {
    background-color: cadetblue;
    float: left;
    border: 5px solid cadetblue;
    box-shadow: 10px 10px 5px 5px #00000050;
    margin: 15px;
}

.imagebox p {
    font-style: italic;
    color: white;
}

.clearfix::after {
  content: "";
  clear: both;
  display: table;
}

.ref {
    font-style: italic;
}

.dogbox {
    margin: 10px;
    background-color: darkcyan;
    color: white;
}

.dogbox ul {
    list-style-type: none;
    padding: 20px 0;
}

.dogbox ul li {
    margin: 10px 40px;
}

footer {
    background-color: cornflowerblue;
    color: red;
    text-align: center;
    margin: 0;
    padding: 1px;
}