.container {
    max-width: 90%;   /* container is 90% of screen width */
    margin: 0 auto;
    padding: 0 20px;
}

@media (min-width:700px) { 
    .container {   
        margin-top: 20px;
        padding-left: 30px;   /* use padding instead of margin */
        padding-right: 30px;  
    }
}

@media (min-width:1200px) {
    .container {
        padding-left: 60px;   /* bigger indentation on wide screens */
        padding-right: 60px;
    }
}

@media (min-width:700px) { 
    .container {   
        margin-top: 20px;
        margin-left: 30px;
        margin-right: 30px;  
    }
}

@media (max-width:400px) { 
    .container {  
        margin-left: 6px;
        margin-right: 6px;       
    }
}

@media (max-width:300px) { 
    .container {  
        margin-left: 1px;
        margin-right: 1px;       
    }
}

@media screen and (max-device-width: 480px) and (orientation: portrait){
    .container {  
        margin-left: 0px;
        margin-right: 0px;       
    }

}