body {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.3em;
}

input[type=text], select {
    width: 50px;
    display: inline-block;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 20px;
}

#content {
    height: 35em;
    overflow: auto;
    display: inline-block;
}

#wrapper {
    text-align: center;
}

table {
    font-family: arial, sans-serif;
    border-collapse: collapse;
    width: auto;
    text-align: center;
    width: 25em;
}

td, th {
    border: 1px solid #dddddd;
    text-align: left;
    padding: 3px;
}

#value {
    width: 4em;
}

tr:nth-child(even) {
    background-color: #dddddd;
}

#total {
    color: green;
    font-size: 50px;
    font-weight: bold;
}