body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
header, footer {
    background-color: #C35038;
    color: white;
    text-align: center;
    padding: 1em 0;
}
nav {
    background-color: #444;
    overflow: hidden;
}
nav a {
    float: left;
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}
nav a:hover {
    background-color: #ddd;
    color: black;
}
.sidebar {
    height: 100%;
    width: 250px;
    position: fixed;
    top: 0;
    left: 0;
    background-color: #111;
    padding-top: 20px;
}
.sidebar a {
    padding: 10px 15px;
    text-decoration: none;
    font-size: 18px;
    color: white;
    display: block;
}
.sidebar a:hover {
    background-color: #575757;
}
.main-content {
    margin-left: 260px;
    padding: 20px;
}
.centerImg {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 50%;
 }
 .centerGalvaImg {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 40%;
 }