body {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

#birds {
    width: calc(100vw - 100px);
    height: calc(100vh - 100px);
    position: fixed;
    top: 50px;
    left: 50px;
    border-radius: 50px;
    overflow: hidden;
}

#birds canvas {
    border-radius: 50px;
}

/* Under 800px wide - 30px margins */
@media (max-width: 800px) {
    #birds {
        width: calc(100vw - 60px);
        height: calc(100vh - 60px);
        top: 30px;
        left: 30px;
        border-radius: 30px;
    }
    
    #birds canvas {
        border-radius: 30px;
    }
}

/* Under 480px wide - 20px margins */
@media (max-width: 480px) {
    #birds {
        width: calc(100vw - 40px);
        height: calc(100vh - 40px);
        top: 20px;
        left: 20px;
        border-radius: 20px;
    }
    
    #birds canvas {
        border-radius: 20px;
    }
}