body {
    background-color: #ddd;
    padding: 0;
    margin: 0;
    height: 100vh;
    width: 100vw;
}

body,
#passes {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

#passes {
    gap: 0.5em;
}

#passes label {
    font-size: 30pt;
    font-family: monospace;
    cursor: text;
}

#passes label span {
    padding: 0 0.1em;
}

#passes label:nth-child(odd) span:nth-child(odd),
#passes label:nth-child(even) span:nth-child(even) {
    color: #006;
}

#passes label:nth-child(even) span:nth-child(odd),
#passes label:nth-child(odd) span:nth-child(even) {
    color: #600;
}

#update-btn {
    cursor: pointer;
    font-size: 3em;
    width: 1em;
    height: 1em;
    line-height: 1;
    padding: 0.5em;
    text-align: center;
    background-color: #4A6;
    color: #FFF;
    border-radius: 1em;
    box-shadow: 2px 2px 5px 2px rgb(0 0 0 / 50%);
    user-select: none;
    margin-top: 1em;
    font-weight: bold;
}