div.header{
    width: 100%;
    text-align: center;
    padding: 20px;
}

div.content{
    max-width: 100%;
    padding: 10px;
    text-align: center;
}

div#import{
    width: 70%;
    display: inline-block;
}

div.button-group{
    padding: 10px;
}

button#do{
    margin-left: 5px; 
}

div#export{
    width: 70%;
    display: inline-block;
    margin: 5px;
}

textarea{
    resize: none;
}

@media screen and (max-width: 600px) {
    div#import{
        width: 90%;
    }

    div#export{
        width: 90%;
    }
}