在CSS动画中水平居中文本

Question

CSS似乎是用第一个字母将文本水平居中。我想在不破坏动画的情况下使其完美地居于页面上。我添加了一个渐变来显示页面的确切水平中心。

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.wrapper {
  height: 100vh;
  background: linear-gradient(to right, #1e5799 0%,#ffffff 50%,#7db9e8 100%);
}

.container {
  text-align: center;
}

.vcenter {
  position: relative;
  top: calc(50%);
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}

.container h2 {
  background: red;
  display: inline-block;
  position: absolute;
  opacity: 0;
  overflow: visible;
  -webkit-animation: rotateWord 12s linear infinite 0s;
  -ms-animation: rotateWord 12s linear infinite 0s;
  animation: rotateWord 12s linear infinite 0s;
  margin: 0;
}

.container h2:nth-child(2) {
  -webkit-animation: rotateWord 12s linear infinite 3s;
  -ms-animation: rotateWord 12s linear infinite 3s;
  animation: rotateWord 12s linear infinite 3s;
}

.container h2:nth-child(3) {
  -webkit-animation: rotateWord 12s linear infinite 6s;
  -ms-animation: rotateWord 12s linear infinite 6s;
  animation: rotateWord 12s linear infinite 6s;
}

.container h2:nth-child(4) {
  -webkit-animation: rotateWord 12s linear infinite 9s;
  -ms-animation: rotateWord 12s linear infinite 9s;
  animation: rotateWord 12s linear infinite 9s;
}

@-webkit-keyframes rotateWord {
  0% {
    opacity: 0;
  }
  2% {
    opacity: 0;
    -webkit-transform: translateY(-30px);
  }
  5% {
    opacity: 1;
    -webkit-transform: translateY(0px);
  }
  17% {
    opacity: 1;
    -webkit-transform: translateY(0px);
  }
  20% {
    opacity: 0;
    -webkit-transform: translateY(30px);
  }
  80% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

@-moz-keyframes rotateWord {
  0% {
    opacity: 0;
  }
  2% {
    opacity: 0;
    -ms-transform: translateY(-30px);
  }
  5% {
    opacity: 1;
    -ms-transform: translateY(0px);
  }
  17% {
    opacity: 1;
    -ms-transform: translateY(0px);
  }
  20% {
    opacity: 0;
    -ms-transform: translateY(30px);
  }
  80% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

@keyframes rotateWord {
  0% {
    opacity: 0;
  }
  2% {
    opacity: 0;
    -webkit-transform: translateY(-30px);
    transform: translateY(-30px);
  }
  5% {
    opacity: 1;
    -webkit-transform: translateY(0px);
    transform: translateY(0px);
  }
  17% {
    opacity: 1;
    -webkit-transform: translateY(0px);
    transform: translateY(0px);
  }
  20% {
    opacity: 0;
    -webkit-transform: translateY(30px);
    transform: translateY(30px);
  }
  80% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

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<div class="wrapper">
  <div class="container vcenter">
    <h2>HEY THERE THIS IS TEXT</h2>
    <h2>DIFFERENT TEXT</h2>
    <h2>THIS IS TEXT</h2>
    <h2>DIFFERENT LENGTHS OF TEXT</h2>
  </div>
</div>

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Answer 1

确保在transform中设置正确的@keyframes值，同时可以移除中间div容器以使其更容易。

<强> jsFiddle

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body {
  margin: 0;
}

.container {
  height: 100vh;
  text-align: center;
  background: linear-gradient(to right, #1e5799 0%, #ffffff 50%, #7db9e8 100%);
}

.container h2 {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  margin: 0;
}

.container h2:nth-child(1) {
  animation: rotateWord 12s linear infinite 0s;
}

.container h2:nth-child(2) {
  animation: rotateWord 12s linear infinite 3s;
}

.container h2:nth-child(3) {
  animation: rotateWord 12s linear infinite 6s;
}

.container h2:nth-child(4) {
  animation: rotateWord 12s linear infinite 9s;
}

@keyframes rotateWord {
  0% {
    opacity: 0;
  }
  2% {
    opacity: 0;
    transform: translate(-50%, -30px);
  }
  5% {
    opacity: 1;
    transform: translate(-50%, 0px);
  }
  17% {
    opacity: 1;
    transform: translate(-50%, 0px);
  }
  20% {
    opacity: 0;
    transform: translate(-50%, 30px);
  }
  80% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

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<div class="container">
  <h2>HEY THERE THIS IS TEXT</h2>
  <h2>DIFFERENT TEXT</h2>
  <h2>THIS IS TEXT</h2>
  <h2>DIFFERENT LENGTHS OF TEXT</h2>
</div>

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