使用bounceInDown类时如何保持h2标签居中？

Question

基本上我有一个居中的 h2 标签，但是每当我从 animate.css 添加bounceInDown 类时，它会使 h2 中的文本不居中。我需要 h2 标记中的文本保持居中，同时仍然使用bounceInDown 类。

它应该是什么样子的示例：

body {
  font-family: "Source Sans Pro", sans-serif;
  color: #ccc;
  z-index: -100;
  background-color: black;
  overflow: hidden;
  text-align: center;
}

h2 {
  display: inline-flex;
  color: aquamarine; 
  font-family: Raleway;
  opacity: .86;
  font-size: 3em;
  flex-direction: column;
  align-items: center;
  margin: 0;
  position: absolute;
  margin-top: 7%;
}

h2>span {
  margin-left: auto;
  font-size: .4em;
  margin-top: -.4em;
}

@-webkit-keyframes bounceIn {
  from, 20%, 40%, 60%, 80%, to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
  }

  0% {
    opacity: 0;
    -webkit-transform: scale3d(.3, .3, .3);
    transform: scale3d(.3, .3, .3);
  }

  20% {
    -webkit-transform: scale3d(1.1, 1.1, 1.1);
    transform: scale3d(1.1, 1.1, 1.1);
  }

  40% {
    -webkit-transform: scale3d(.9, .9, .9);
    transform: scale3d(.9, .9, .9);
  }

  60% {
    opacity: 1;
    -webkit-transform: scale3d(1.03, 1.03, 1.03);
    transform: scale3d(1.03, 1.03, 1.03);
  }

  80% {
    -webkit-transform: scale3d(.97, .97, .97);
    transform: scale3d(.97, .97, .97);
  }

  to {
    opacity: 1;
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }
}

@keyframes bounceIn {
  from, 20%, 40%, 60%, 80%, to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
  }

  0% {
    opacity: 0;
    -webkit-transform: scale3d(.3, .3, .3);
    transform: scale3d(.3, .3, .3);
  }

  20% {
    -webkit-transform: scale3d(1.1, 1.1, 1.1);
    transform: scale3d(1.1, 1.1, 1.1);
  }

  40% {
    -webkit-transform: scale3d(.9, .9, .9);
    transform: scale3d(.9, .9, .9);
  }

  60% {
    opacity: 1;
    -webkit-transform: scale3d(1.03, 1.03, 1.03);
    transform: scale3d(1.03, 1.03, 1.03);
  }

  80% {
    -webkit-transform: scale3d(.97, .97, .97);
    transform: scale3d(.97, .97, .97);
  }

  to {
    opacity: 1;
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }
}

.bounceIn {
  -webkit-animation-name: bounceIn;
  animation-name: bounceIn;
}

@-webkit-keyframes bounceInDown {
  from, 60%, 75%, 90%, to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
  }

  0% {
    opacity: 0;
    -webkit-transform: translate3d(0, -3000px, 0);
    transform: translate3d(0, -3000px, 0);
  }

  60% {
    opacity: 1;
    -webkit-transform: translate3d(0, 25px, 0);
    transform: translate3d(0, 25px, 0);
  }

  75% {
    -webkit-transform: translate3d(0, -10px, 0);
    transform: translate3d(0, -10px, 0);
  }

  90% {
    -webkit-transform: translate3d(0, 5px, 0);
    transform: translate3d(0, 5px, 0);
  }

  to {
    -webkit-transform: none;
    transform: none;
  }
}

@keyframes bounceInDown {
  from, 60%, 75%, 90%, to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
  }

  0% {
    opacity: 0;
    -webkit-transform: translate3d(0, -3000px, 0);
    transform: translate3d(0, -3000px, 0);
  }

  60% {
    opacity: 1;
    -webkit-transform: translate3d(0, 25px, 0);
    transform: translate3d(0, 25px, 0);
  }

  75% {
    -webkit-transform: translate3d(0, -10px, 0);
    transform: translate3d(0, -10px, 0);
  }

  90% {
    -webkit-transform: translate3d(0, 5px, 0);
    transform: translate3d(0, 5px, 0);
  }

  to {
    -webkit-transform: none;
    transform: none;
  }
}

.bounceInDown {
  -webkit-animation-name: bounceInDown;
  animation-name: bounceInDown;
}

<h2 class="animated bounceInDown">
  Al-Saba<span>.net</span>
</h2>

Answer 1

添加left: 50%; transform: translateX(-50%);

body {
  font-family: "Source Sans Pro", sans-serif;
  color: #ccc;
  z-index: -100;
  background-color: black;
  overflow: hidden;
  text-align: center;
}

h2 {
  display: inline-flex;
  color: aquamarine; 
  font-family: Raleway;
  opacity: .86;
  font-size: 3em;
  flex-direction: column;
  align-items: center;
  margin: 0;
  position: absolute;
  margin-top: 7%;
  left: 50%;
  transform: translateX(-50%);
}

h2>span {
  margin-left: auto;
  font-size: .4em;
  margin-top: -.4em;
}

@-webkit-keyframes bounceIn {
  from, 20%, 40%, 60%, 80%, to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
  }

  0% {
    opacity: 0;
    -webkit-transform: scale3d(.3, .3, .3);
    transform: scale3d(.3, .3, .3);
  }

  20% {
    -webkit-transform: scale3d(1.1, 1.1, 1.1);
    transform: scale3d(1.1, 1.1, 1.1);
  }

  40% {
    -webkit-transform: scale3d(.9, .9, .9);
    transform: scale3d(.9, .9, .9);
  }

  60% {
    opacity: 1;
    -webkit-transform: scale3d(1.03, 1.03, 1.03);
    transform: scale3d(1.03, 1.03, 1.03);
  }

  80% {
    -webkit-transform: scale3d(.97, .97, .97);
    transform: scale3d(.97, .97, .97);
  }

  to {
    opacity: 1;
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }
}

@keyframes bounceIn {
  from, 20%, 40%, 60%, 80%, to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
  }

  0% {
    opacity: 0;
    -webkit-transform: scale3d(.3, .3, .3);
    transform: scale3d(.3, .3, .3);
  }

  20% {
    -webkit-transform: scale3d(1.1, 1.1, 1.1);
    transform: scale3d(1.1, 1.1, 1.1);
  }

  40% {
    -webkit-transform: scale3d(.9, .9, .9);
    transform: scale3d(.9, .9, .9);
  }

  60% {
    opacity: 1;
    -webkit-transform: scale3d(1.03, 1.03, 1.03);
    transform: scale3d(1.03, 1.03, 1.03);
  }

  80% {
    -webkit-transform: scale3d(.97, .97, .97);
    transform: scale3d(.97, .97, .97);
  }

  to {
    opacity: 1;
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }
}

.bounceIn {
  -webkit-animation-name: bounceIn;
  animation-name: bounceIn;
}

@-webkit-keyframes bounceInDown {
  from, 60%, 75%, 90%, to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
  }

  0% {
    opacity: 0;
    -webkit-transform: translate3d(0, -3000px, 0);
    transform: translate3d(0, -3000px, 0);
  }

  60% {
    opacity: 1;
    -webkit-transform: translate3d(0, 25px, 0);
    transform: translate3d(0, 25px, 0);
  }

  75% {
    -webkit-transform: translate3d(0, -10px, 0);
    transform: translate3d(0, -10px, 0);
  }

  90% {
    -webkit-transform: translate3d(0, 5px, 0);
    transform: translate3d(0, 5px, 0);
  }

  to {
    -webkit-transform: none;
    transform: none;
  }
}

@keyframes bounceInDown {
  from, 60%, 75%, 90%, to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
  }

  0% {
    opacity: 0;
    -webkit-transform: translate3d(0, -3000px, 0);
    transform: translate3d(0, -3000px, 0);
  }

  60% {
    opacity: 1;
    -webkit-transform: translate3d(0, 25px, 0);
    transform: translate3d(0, 25px, 0);
  }

  75% {
    -webkit-transform: translate3d(0, -10px, 0);
    transform: translate3d(0, -10px, 0);
  }

  90% {
    -webkit-transform: translate3d(0, 5px, 0);
    transform: translate3d(0, 5px, 0);
  }

  to {
    -webkit-transform: none;
    transform: none;
  }
}

.bounceInDown {
  -webkit-animation-name: bounceInDown;
  animation-name: bounceInDown;
}

<h2 class="animated bounceInDown">
  Al-Saba<span>.net</span>
</h2>