body {
    font-family: Arial, Helvetica, sans-serif;
}

div.container {
    margin: 0 auto;
}

div.content {
    width: 40%;
    height: auto;
    margin: 0 auto;
    position: relative;
}

@media screen and (max-width: 1440px) {
    div.content {
        width: 60%;
        height: auto;
        margin: 0 auto;
        position: relative;
    }
}

@media screen and (max-width: 1080px) {
    div.content {
        width: 80%;
        height: auto;
        margin: 0 auto;
        position: relative;
    }
}

@media screen and (max-width: 768px) {
    div.content {
        width: 100%;
        height: auto;
        margin: 0 auto;
        position: relative;
    }
}