app/assets/stylesheets/responsive/_one_time_passwords_style.scss
.one-time-password__otp-code {
font-family: monospace;
font-size: 6em;
font-weight: bold;
line-height: 1em;
}
.one-time-password__otp-info {
background: white;
border: 3px solid red;
font-size: 1.1rem;
padding: 1em 1em 0 1em;
}