Animated background overlays page

Question

Good,

I’m doing a login page, and I wanted to put an animated wave background to represent the image of the company, but it turns out I’m not yet very experienced in this field, and I’m trying to use someone else’s code on mine to put this wave animation behind Login. I don’t know why, but the background is ahead of everything, and you only see this animation! What do I do?

Waves (CSS):

    @keyframes move_wave {
    0% {
        transform: translateX(0) translateZ(0) scaleY(1)
    }
    50% {
        transform: translateX(-25%) translateZ(0) scaleY(0.55)
    }
    100% {
        transform: translateX(-50%) translateZ(0) scaleY(1)
    }
}
.waveWrapper {
    overflow: hidden;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    top: 0;
    margin: auto;
}
.waveWrapperInner {
    position: absolute;
    width: 100%;
    overflow: hidden;
    height: 100%;
    bottom: -1px;
    background-image: linear-gradient(to top, #86377b 20%, #27273c 80%);
}
.bgTop {
    z-index: 15;
    opacity: 0.5;
}
.bgMiddle {
    z-index: 10;
    opacity: 0.75;
}
.bgBottom {
    z-index: 5;
}
.wave {
    position: absolute;
    left: 0;
    width: 200%;
    height: 100%;
    background-repeat: repeat no-repeat;
    background-position: 0 bottom;
    transform-origin: center bottom;
}
.waveTop {
    background-size: 50% 100px;
}
.waveAnimation .waveTop {
  animation: move-wave 3s;
   -webkit-animation: move-wave 3s;
   -webkit-animation-delay: 1s;
   animation-delay: 1s;
}
.waveMiddle {
    background-size: 50% 120px;
}
.waveAnimation .waveMiddle {
    animation: move_wave 10s linear infinite;
}
.waveBottom {
    background-size: 50% 100px;
}
.waveAnimation .waveBottom {
    animation: move_wave 15s linear infinite;
}

Waves (HTML):

    <div class="waveWrapper waveAnimation">
  <div class="waveWrapperInner bgTop">
    <div class="wave waveTop" style="background-image: url('http://front-end-noobs.com/jecko/img/wave-top.png')"></div>
  </div>
  <div class="waveWrapperInner bgMiddle">
    <div class="wave waveMiddle" style="background-image: url('http://front-end-noobs.com/jecko/img/wave-mid.png')"></div>
  </div>
  <div class="waveWrapperInner bgBottom">
    <div class="wave waveBottom" style="background-image: url('http://front-end-noobs.com/jecko/img/wave-bot.png')"></div>
  </div>
</div>

If you can help!

Answer 1

Just put z-index: -1; in div waveWrapper which is where the animation is inside.

I believe this will facilitate the management of your z-index, besides that the background will always be last in the background, and you don’t need to worry about z-index other than -1 of the weveWrapper

@keyframes move_wave {
  0% {
    transform: translateX(0) translateZ(0) scaleY(1)
  }
  50% {
    transform: translateX(-25%) translateZ(0) scaleY(0.55)
  }
  100% {
    transform: translateX(-50%) translateZ(0) scaleY(1)
  }
}
.waveWrapper {
  overflow: hidden;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  margin: auto;
  z-index: -1;
}
.waveWrapperInner {
  position: absolute;
  width: 100%;
  overflow: hidden;
  height: 100%;
  bottom: -1px;
  background-image: linear-gradient(to top, #86377b 20%, #27273c 80%);
}
.bgTop {
  z-index: 15;
  opacity: 0.5;
}
.bgMiddle {
  z-index: 10;
  opacity: 0.75;
}
.bgBottom {
  z-index: 5;
}
.wave {
  position: absolute;
  left: 0;
  width: 200%;
  height: 100%;
  background-repeat: repeat no-repeat;
  background-position: 0 bottom;
  transform-origin: center bottom;
}
.waveTop {
  background-size: 50% 100px;
}
.waveAnimation .waveTop {
  animation: move-wave 3s;
   -webkit-animation: move-wave 3s;
   -webkit-animation-delay: 1s;
   animation-delay: 1s;
}
.waveMiddle {
  background-size: 50% 120px;
}
.waveAnimation .waveMiddle {
  animation: move_wave 10s linear infinite;
}
.waveBottom {
  background-size: 50% 100px;
}
.waveAnimation .waveBottom {
  animation: move_wave 15s linear infinite;
}

<div class="waveWrapper waveAnimation">
	  <div class="waveWrapperInner bgTop">
		<div class="wave waveTop" style="background-image: url('http://front-end-noobs.com/jecko/img/wave-top.png')"></div>
	  </div>
	  <div class="waveWrapperInner bgMiddle">
		<div class="wave waveMiddle" style="background-image: url('http://front-end-noobs.com/jecko/img/wave-mid.png')"></div>
	  </div>
	  <div class="waveWrapperInner bgBottom">
		<div class="wave waveBottom" style="background-image: url('http://front-end-noobs.com/jecko/img/wave-bot.png')"></div>
	  </div>
	</div>

	<p style="color:#fff">
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	</p>
	<input type="text">