style.css

* { margin:0; padding:0; font-size: 1em;} /* to remove the top and left whitespace */

html, body { width:100%; height:100%; } /* just to be sure these are full screen*/

body {
    text-align: center;
}

canvas {
    /* background: #eeeeee; */
    background-color: white;
    display: block;     /* to remove the scrollbars */
}

#menu {
    width: 100%;
    margin: 0;
    padding: 20px;
    /* background-color: green; */

    text-align: left;
}

#optionsForm {
    margin: 0;
}

#naca {
    width: 50px;
    box-sizing: border-box;
    display: inline-block;
}

.checkLabel {
    display: inline-block;
}

.check {
    margin-right: 20px;
}

#input_error {
    background-color: #ffcccb;
    padding: 10px;
    margin-bottom: 20px;
    color: red;
    border-radius: 4px;
    display: none;
}

/* Larger than phablet */
@media (min-width: 550px) {
    * {
        font-size: 1em;
    }

    #menu {
        width: 800px;
        margin: auto;
        padding: 20px;
        /* background-color: green; */
    
        text-align: left;
    }
}