.mnemonic_customize {
    border: 3px solid black;
    border-radius: 18px;
    height: 2rem;
    width: 5rem;
    outline: none;
    text-align: center;
}

.customize {
    border-color: blue;
}

.mnemonic_customize_input {
    display: block;
    width: 8rem;
    text-align: right;
}