.mainBody { 
    margin-top: 350px; 
}

h2 {
    margin-bottom: 20px;
}

@media screen and (max-width: 939px) {

    body {
        background: none;
    }

    .mainBody { 
        margin-top: 0;
    }

    body { 
        background: none center -40px; background-color: #fff;
    }

}