Pure CSS3 Create realistic multi-layer cloud animation effects

Brief Tutorials

This is a very cool effect of pure CSS3 lifelike multi-layer cloud animation effects. This effect uses multiple transparent cloud PNG images as background images, and uses CSS animation animations to animate the horizontal fluttering of clouds.

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　How to use

HTML structure

The HTML structure of the multi-layer cloud animation effect is very simple: use a P.sky as the background layer of the feed, and place many sub-<p> as cloud containers inside it.

<p class= "Sky" >    <p class= "Clouds_one" ></p>    <p class= "Clouds_two" ></p>    <p class= "Clouds_three" ></p></p>

CSS Styles

As the sky background. The sky element sets a fixed height, uses relative positioning, and uses Overflow:hidden to hide out-of-bounds elements. At the beginning, the color of the sky is set to a lighter blue #007fd5. A sky_background CSS3 animation animation is then set for the sky background, which transitions the sky background color from light blue to dark blue for 50 seconds, The animation's animation-timing-function is Ease-out, and the number of iterations of the animation animation-iteration-count to an infinite loop.

In this effect, each element is set with the Transform:translate3d (0, 0, 0) attribute, which is used to turn on the 3D effect of the GPU and improve the performance of the display.

. Sky {    height:480px;    Background: #007fd5;    position:relative;    Overflow:hidden;    -webkit-animation:sky_background 50s ease-out Infinite;    -moz-animation:sky_background 50s ease-out Infinite;    -o-animation:sky_background 50s ease-out Infinite;    Animation:sky_background 50s ease-out Infinite;    -webkit-transform:translate3d (0, 0, 0);    -ms-transform:translate3d (0, 0, 0);    -o-transform:translate3d (0, 0, 0);    Transform:translate3d (0, 0, 0);  }  @keyframes Sky_background {    0% {      background: #007fd5;      Color: #007fd5    }    50% {      background: #000;      Color: #a3d9ff    }    100% {      background: #007fd5;      Color: #007fd5    }  }

Cloud 1 uses the first cloud PNG image as the background image, using absolute positioning, relative to the sky container to align left. The height is equal to the sky and is 3 times times the width of the sky container. and perform cloud_one CSS3 animations. The animation modifies the left property of the cloud layer to make the cloud move horizontally.

. clouds_one {    background:url ("Img/cloud_one.png");    Position:absolute;    left:0;    top:0;    height:100%;    width:300%;    -webkit-animation:cloud_one 50s linear infinite;    -moz-animation:cloud_one 50s linear infinite;    -o-animation:cloud_one 50s linear infinite;    Animation:cloud_one 50s linear infinite;    -webkit-transform:translate3d (0, 0, 0);    -ms-transform:translate3d (0, 0, 0);    -o-transform:translate3d (0, 0, 0);    Transform:translate3d (0, 0, 0);  }  @keyframes Cloud_one {    0% {      left:0    }    100% {left      : -200%    }  }

The CSS3 animations of Cloud 2 and cloud 3 are basically similar to Cloud 1, except that the duration of the animation is Animation-duration different, the duration of the Cloud 1 is 50 seconds, the duration of the Cloud 2 is 75 seconds, and the duration of the Cloud 3 is 100 seconds. In this way, the animation time of each cloud is different, and the effect of some background visual difference will be obtained.