Colocar imagem no background

#botao{
    padding-bottom: 30px;
}

#logo{
    padding-bottom: 50px;
}

.button{
    background-color: #BA55D3;
}

.myview{
    background-image: url('TCC/PMBOK/img/logo.png') no-repeat center center fixed;
    background-color: transparent;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    background-size: cover;
}