* {
    box-sizing: border-box;   
    margin: 0;
    padding: 0;
}

body {
    margin: 0;
    padding: 0;
}

 button{
    width: 100%;
    font-size: 2em;
}
input, button, select{
    width: 100%;
    font-size: 2em;
}

table {
    border: 1px;
    border-collapse: collapse;
}

td,th {
    border: 1px solid black;
}

/*div#content {*/
    /*display: none;*/
/*}*/