body {
    text-align: center;
}

#boxOption {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    margin: 0 auto;
    width: 50%;
}

#boxOption > div {
    margin-bottom: 10px;
    text-align: left;
    width: 100%;
}

#targetcharacterCount {
    width: 4em;
}

input[type="checkbox"], input[type="number"] {
    margin-right: 10px;
}