body.sky {
    background: radial-gradient(circle 10vw at center, #aedef8), #48bdfc;
}
.banner{
    margin-top: 7%;
    width: 95%;
    z-index: 5;
}

.b_desktop{
    display: none;
}

.clouds{
    z-index: 0;
}
.footer{
    margin-top: 3vw;
}

@media (min-width:850px){
    .b_desktop{
        display: block;
    }
    .footer{
        width: 20vw;
    }
    .b_mobile{
        display: none;
    }
    .banner{
        margin-top: 5%;
        width: 45%;
    }
}