html{
    background-image: url('../img/backgroundMain.jpg');
}
.collapsible-body{
    background-color: white;
}
nav{
    background-color: black;
   
}
nav .brand-logo {
   
    height: 100%;
    padding: 10px;
}
nav h4{
    margin-top: 50px;
    position: relative;
    margin: 0 auto;
    width: 300px;
}
a {

    text-decoration: underline;
}