Video Inside Text Effect: CSS Text Animation

Video Inside Text Effect

A sunset plays inside heavy letters: the sun sinks into the sea while ripples roll toward you. Layered gradients clipped to the text, moved by two registered properties, no video file needed.

Also known as: video inside text css, text mask video effect, image inside text animation, knockout text css.

SUNSET

Color Font size 40px Dark background

HTML

<div class="txt-video-knockout-text">SUNSET</div>

CSS

@property --txt-video-knockout-text-sun {
  syntax: "<percentage>";
  inherits: false;
  initial-value: 30%;
}
@property --txt-video-knockout-text-o {
  syntax: "<length>";
  inherits: false;
  initial-value: 0px;
}
.txt-video-knockout-text {
  --c: var(--txt-color, #3b82f6);
  font-size: calc(var(--txt-size, 32px) * 2.6);
  font-family: system-ui, sans-serif;
  font-weight: 900;
  line-height: 1.2;
  display: inline-block;
  line-height: 1;
  letter-spacing: -0.03em;
  --o: var(--txt-video-knockout-text-o);
  background:
    repeating-linear-gradient(180deg,
      transparent var(--o),
      rgba(12, 10, 40, 0.45) calc(var(--o) + 0.025em),
      transparent calc(var(--o) + 0.06em),
      transparent calc(var(--o) + 0.13em)) bottom / 100% 40% no-repeat,
    radial-gradient(24% 90% at 50% 0%, #ffd79a, rgba(255, 140, 90, 0.5) 45%, transparent) bottom / 100% 40% no-repeat,
    linear-gradient(color-mix(in srgb, var(--c) 30%, #3a2466), #120d2c) bottom / 100% 40% no-repeat,
    radial-gradient(circle at 50% var(--txt-video-knockout-text-sun), #fff4c8 0, #ffc46b 0.2em, #ff7a59 0.36em, rgba(255, 122, 89, 0.35) 0.5em, transparent 0.95em),
    linear-gradient(180deg, color-mix(in srgb, var(--c) 55%, #1b1036) 0%, #c2507a 42%, #ff9a6a 60%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0.06em 0.2em rgba(255, 122, 89, 0.3));
  animation:
    txt-video-knockout-text-set 9s cubic-bezier(0.45, 0, 0.55, 1) infinite alternate,
    txt-video-knockout-text-sea 1.4s linear infinite;}
@keyframes txt-video-knockout-text-set {
  from { --txt-video-knockout-text-sun: 26%; }
  to   { --txt-video-knockout-text-sun: 72%; }
}
@keyframes txt-video-knockout-text-sea {
  to { --txt-video-knockout-text-o: 0.13em; }
}
@media (prefers-reduced-motion: reduce) {
  .txt-video-knockout-text { animation: none; --txt-video-knockout-text-sun: 52%; }
}

@media (prefers-reduced-motion: reduce) {
  .txt-video-knockout-text, .txt-video-knockout-text *, .txt-video-knockout-text::before, .txt-video-knockout-text::after, .txt-video-knockout-text *::before, .txt-video-knockout-text *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

Customizing this snippet

Color: set --txt-color on the element or a parent. Currently previewing #3b82f6.
Font size: set --txt-size. Every other dimension is in em, so the whole thing scales together. Currently previewing 40px.
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.

Video Inside Text Effect

HTML

CSS

Customizing this snippet

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