Countdown Timer Border: CSS Border Animation

Countdown Timer Border

The border empties clockwise from the top like a timer while the number counts down, then refills. The number is a CSS counter fed by a registered @property integer, so no script runs it.

Also known as: border countdown timer css, border progress animation, timer border css.

Resend code in s

Color Base size 16px Dark background Hold hover state

HTML

<div class="bdr-countdown-timer-border">
  <svg class="bdr-countdown-timer-border-svg" viewBox="0 0 150 85" preserveAspectRatio="none" aria-hidden="true">
    <path class="bdr-countdown-timer-border-track" d="M75 0H140A10 10 0 0 1 150 10V75A10 10 0 0 1 140 85H10A10 10 0 0 1 0 75V10A10 10 0 0 1 10 0Z"/>
    <path class="bdr-countdown-timer-border-time" d="M75 0H140A10 10 0 0 1 150 10V75A10 10 0 0 1 140 85H10A10 10 0 0 1 0 75V10A10 10 0 0 1 10 0Z" pathLength="100"/>
  </svg>
  <span>Resend code in <span class="bdr-countdown-timer-border-n"></span>s</span>
</div>

CSS

@property --bdr-countdown-timer-border-n {
  syntax: "<integer>";
  inherits: false;
  initial-value: 5;
}
.bdr-countdown-timer-border {
  --c: var(--bdr-color, #3b82f6);
  font-size: var(--bdr-size, 16px);
  position: relative;
  display: grid;
  place-items: center;
  width: 15em;
  height: 8.5em;
  border-radius: 1em;
  font-family: system-ui, sans-serif;
  font-weight: 600;
  --t: 6s;
  background: color-mix(in srgb, var(--c) 5%, transparent);
  font-variant-numeric: tabular-nums;
}
.bdr-countdown-timer-border-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}
.bdr-countdown-timer-border-svg path {
  fill: none;
  stroke-width: 1.6;
}
.bdr-countdown-timer-border-track { stroke: color-mix(in srgb, var(--c) 16%, transparent); }
.bdr-countdown-timer-border-time {
  stroke: var(--c);
  stroke-linecap: round;
  stroke-dasharray: 100 100;
  animation: bdr-countdown-timer-border-drain var(--t) linear infinite;
}
.bdr-countdown-timer-border-n {
  counter-reset: bdr-countdown-timer-border var(--bdr-countdown-timer-border-n);
  color: var(--c);
  animation: bdr-countdown-timer-border-count var(--t) infinite;
}
.bdr-countdown-timer-border-n::after { content: counter(bdr-countdown-timer-border); }
@keyframes bdr-countdown-timer-border-drain {
  0%     { stroke-dashoffset: 0; }
  83.33% { stroke-dashoffset: -100; animation-timing-function: cubic-bezier(0.65, 0, 0.35, 1); }
  100%   { stroke-dashoffset: -200; }
}
@keyframes bdr-countdown-timer-border-count {
  0%            { --bdr-countdown-timer-border-n: 5; animation-timing-function: steps(5, end); }
  83.33%        { --bdr-countdown-timer-border-n: 0; }
  83.34%, 100%  { --bdr-countdown-timer-border-n: 5; }
}

@media (prefers-reduced-motion: reduce) {
  .bdr-countdown-timer-border, .bdr-countdown-timer-border *, .bdr-countdown-timer-border::before, .bdr-countdown-timer-border::after, .bdr-countdown-timer-border *::before, .bdr-countdown-timer-border *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

Customizing this snippet

Color: set --bdr-color on the element or a parent. Currently previewing #3b82f6.
Base size: set --bdr-size. Every other dimension is in em, so the whole thing scales together. Currently previewing 16px.
Speed: change the duration on the transition or animation shorthand. Staggered delays are relative, so they keep their rhythm.
Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.

Countdown Timer Border

HTML

CSS

Customizing this snippet

Similar border animations