html,body {
    margin: 0%;
}

.main-section {
    background: url(../assets/background.jpg);
    padding: 100px;
    margin: 0px;
    height: 100%;  
    background-attachment: fixed;
    background-position: center;
    background-image: no-repeat;
    background-size: cover;
    color: ghostwhite;
}

.top-heading {
    background-color: black;
}

.mid-heading {
    background-color: black;
}

.bottom-heading {
    background-color: black;
}