视频背景文字遮罩动画失效求助：mix-blend-mode使用问题

API 探路者

2026-6-30

视频背景文字遮罩动画实现问题

我想做一个视频背景的文字遮罩动画，效果是：一开始文字和背景颜色一致，之后文字变成透明，露出底下的视频背景。但试了好多次都没成功，已经试过mix-blend-mode和透明背景，都解决不了问题。

现有代码：

CSS

body {
  overflow: hidden;
}

* {
  margin: 0;
  padding: 0;
}

.video-background {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.video-background > video {
  width: 100vw;
  height: 100vh;
  object-fit: cover;
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  z-index: -1;
}

.video-background > img {
  width: 100vw;
  height: 100vh;
  object-fit: cover;
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;

  /* animation: scale 6s forwards 1s; */
}

.video-background > div {
  width: 100vw;
  height: 100vh;
  /* opacity: 0%; */
  background-color: #1a1a1a;
  animation: fade 3s forwards;
}

.video-background > div {
  position: absolute;
  top: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #fff;
  color: #fff;
  mix-blend-mode: multiply;
  animation: to-white 3.5s forwards, blend 3.5s forwards, scale 4s forwards 4s;
}

.video-background > span {
  position: absolute;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Ramabhadra', sans-serif;
  width: 100%;
  height: 100%;
  /* top: -6%;
  left: 0%; */
  font-size: 37vw;
  font-weight: 700;
  user-select: none;
  color: #fff;
  letter-spacing: 0.75rem;

  animation: slide-in 2s forwards 500ms;
  transform: translateY(-150%);
}

@keyframes scale {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(250);
    display: none;
  }
}

@keyframes slide-in {
  0% {
    transform: translateY(-100%);
  }

  70% {
    transform: translateY(0%);
  }

  100% {
    transform: translateY(0%);
  }
}

@keyframes to-white {
  0% {
    color: #141414;
    background-color: #1a1a1a;
  }

  75% {
    color: #141414;
    background-color: #1a1a1a;
  }

  76% {
    background-color: #000;
  }

  100% {
    color: #fff;
    background-color: #000;
  }
}

@keyframes fade {
  0% {
    opacity: 100%;
  }

  70% {
    opacity: 100%;
  }

  100% {
    opacity: 0%;
  }
}

/*
video-background > span {
  position: absolute;
  font-family: "IntervalNextWideBold";
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  font-size: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-transform: uppercase;
  font-weight: 800;
  animation-name: drop-down;
  animation-duration: 3.6s;
  animation-direction: normal;
  transition: 1s;
  user-select: none;
  mix-blend-mode: multiply;
}

@keyframes drop-down {
  0% {
    transform: translateY(-100%);
    color: #fff;
  }
  50% {
    transform: translateY(-100%);
  }
  80% {
    transform: translateY(0%);
    color: #fff;
  }
  100% {
    
    color: #fff;
  }
}

@keyframes background-fix {
  0% {
    opacity: 0;
  }
  80% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
} 

@keyframes blah-blah {
  0% {
    background-color: #000;
  }
  80% {
    background-color: #000;
  }
  100% {
    background-color: #fff;
  }
}
*/

HTML

<!DOCTYPE html>
<html>

<head>
    <meta charset='utf-8'>
    <meta http-equiv='X-UA-Compatible' content='IE=edge'>
    <title>test</title>
    <meta name='viewport' content='width=device-width, initial-scale=1'>
    <link rel='stylesheet' type='text/css' media='screen' href='main.css'>
    <script src='main.js'></script>
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Ramabhadra&display=swap" rel="stylesheet">
</head>

<body>
    <div class="video-background">
        <video src="video.mp4" autoPlay loop muted></video>
        <div></div>
        <!-- <img src="/GPSI-background.svg" alt="background" /> -->
        <span>GPSI</span>
    </div>
</body>

</html>

修复方案：

你的代码存在元素层级冲突、动画逻辑混乱的问题，调整后可以实现目标效果：

修改后的CSS

body {
  overflow: hidden;
}

* {
  margin: 0;
  padding: 0;
}

.video-background {
  width: 100%;
  height: 100vh;
  overflow: hidden;
  position: relative; /* 定位基准，确保内部元素层级正确 */
}

.video-background > video {
  width: 100vw;
  height: 100vh;
  object-fit: cover;
  position: absolute;
  left: 0;
  top: 0;
  z-index: -1;
}

/* 遮罩层：负责背景色过渡 */
.video-background .mask-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #1a1a1a; /* 初始背景色与文字一致 */
  animation: mask-fade 3.5s forwards;
}

/* 遮罩文字：负责下滑+颜色过渡 */
.video-background .mask-text {
  font-family: 'Ramabhadra', sans-serif;
  font-size: 37vw;
  font-weight: 700;
  user-select: none;
  color: #1a1a1a; /* 初始文字色与背景一致 */
  letter-spacing: 0.75rem;
  mix-blend-mode: difference; /* 关键：混合模式实现遮罩效果 */
  animation: text-reveal 3.5s forwards 0.5s;
  transform: translateY(-100%);
}

/* 遮罩层背景从深色变透明 */
@keyframes mask-fade {
  0% {
    background-color: #1a1a1a;
  }
  70% {
    background-color: #1a1a1a;
  }
  100% {
    background-color: transparent;
  }
}

/* 文字下滑+颜色从同背景色变白色（配合混合模式露出视频） */
@keyframes text-reveal {
  0% {
    transform: translateY(-100%);
    color: #1a1a1a;
  }
  70% {
    transform: translateY(0);
    color: #1a1a1a;
  }
  100% {
    transform: translateY(0);
    color: #fff;
  }
}

修改后的HTML

<!DOCTYPE html>
<html>

<head>
    <meta charset='utf-8'>
    <meta http-equiv='X-UA-Compatible' content='IE=edge'>
    <title>test</title>
    <meta name='viewport' content='width=device-width, initial-scale=1'>
    <link rel='stylesheet' type='text/css' media='screen' href='main.css'>
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Ramabhadra&display=swap" rel="stylesheet">
</head>

<body>
    <div class="video-background">
        <video src="video.mp4" autoPlay loop muted></video>
        <div class="mask-layer">
            <span class="mask-text">GPSI</span>
        </div>
    </div>
</body>

</html>

关键调整说明：

给.video-background添加position: relative，统一内部元素的定位基准
合并重复的div样式，将文字放入遮罩层内，结构更清晰
使用mix-blend-mode: difference实现文字与背景的颜色对比，当背景变透明时，文字会自然透出底层视频
简化动画逻辑，拆分遮罩层背景过渡和文字的下滑+颜色变化动画，时序更贴合需求
移除无效的scale动画（CSS动画不支持修改display属性）

内容的提问来源于stack exchange，提问作者HassenBenHadjHassen