Sellify Helpdesk

Yes, you just need to add the following css in custom css box on settings page

/* For Theme 1 */
.uct-theme-1.sellify-countdown-timer-holder {
  padding:0 10px;
  font-size:12px;
}

/* For Theme 2 */
.uct-theme-2.sellify-countdown-timer-holder {
  padding:0 10px;
  font-size:12px;
}
.uct-theme-2 .sellify-countdown-timer > span {
  margin:0;
}
.uct-theme-2 .sellify-countdown-timer span.ts-value {
  font-size:24px;
}
.uct-theme-2 .sellify-countdown-timer span.ts-unit {
  font-size:10px;
}

/* For Theme 3 */
.uct-theme-3.sellify-countdown-timer-holder {
  padding:0 10px;
  font-size:12px;
}
.uct-theme-3 .sellify-countdown-timer span.ts-value {
  padding:5px;
  font-size:18px;
}
.uct-theme-3 .sellify-countdown-timer span.ts-unit {
  font-size:10px;
}
.uct-theme-3 .sellify-countdown-timer > span + span span.ts-value::before {
  font-size:30px;
  margin-right:5px;
}
.uct-theme-3 .sellify-countdown-timer > span {
  padding:5px 10px 0 10px;
}

/* For Theme 4 */
.uct-theme-4.sellify-countdown-timer-holder {
  padding:2px 10px;
  font-size:12px;
}
.uct-theme-4 .sellify-countdown-timer > span {
  border-width:3px;
  margin:2px 5px;
  width:50px;
  height:50px;
}
.uct-theme-4 .sellify-countdown-timer span.ts-unit {
  line-height:27px;
}
.uct-theme-4 .sellify-countdown-timer > span {
  grid-template-rows:38% 1fr;
}
.uct-theme-4 .sellify-countdown-timer span.ts-value {
  font-size:16px;
}