body{
    height: 683px;
    background: #fff url(../images/river-rocks.jpg)no-repeat center top;
 
    background-attachment: fixed;
    background-size: cover;
    text-align: center;
}
.row.header{
height:50px;
}
a.btn {
    color:white;
    background-color:rgb(67,89,115);
}
div#main.col-6 {
    background:rgba(255,255,255,.87);
    padding:2em;
  
}
div.contact, div.classes, div.products {
    margin-bottom:1em;
}