table[data-memory-view] td, table[data-memory-view] th {
    font-family: 'Courier New', Courier, monospace;
    text-align: center;
}

table[data-memory-view] input {
    width: 3ch;
    box-sizing: content-box;
    font-weight: bold;
    font-family: 'Courier New', Courier, monospace;
    text-align: right;
    padding-top: 0;
    padding-bottom: 0;
}

table[data-memory-view] input.invalid {
    color: #900;
    background-color: #fcc;
    border: 1px solid red;
}