body {
    background: lightcyan url('img/Untitled-17.png') no-repeat center fixed;
}

@media screen and (max-width:1700px) {
    body {
        background: rgb(176, 233, 233) url('img/Untitled-16.png') no-repeat center fixed;
    }
}

@media screen and (max-width:1500px) {
    body {
        background: rgb(100, 199, 199) url('img/Untitled-15.png') no-repeat center fixed;
    }
}

@media screen and (max-width:1300px) {
    body {
        background: rgb(81, 221, 221) url('img/Untitled-14.png') no-repeat center fixed;
    }
}

@media screen and (max-width:1100px) {
    body {
        background: rgb(16, 181, 181) url('img/Untitled-13.png') no-repeat center fixed;
    }
}

@media screen and (max-width:900px) {
    body {
        background: rgb(0, 115, 115) url('img/Untitled-18.png') no-repeat center fixed;
    }
}