freeCodeCamp/guide/english/css/using-css-animations/index.md

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Using CSS Animations

Using CSS Animations

CSS animations change elements from one CSS style to another.
There are no limits to how many CSS propreties you can change.

@Keyframes

CSS animations work by using keyframes, which define what style the element has at any given time.

/* Using from/to */

@keyframes animationName {
    from {opacity: 1;}
    to {opacity: 0;}
}

/* Using Values */

@keyframes animationName {
    0% {opacity: 1;}
    50% {opacity: 0;}
    100% {opacity: 1;}
}

To create a CSS animation sequence, we have different sub-properties in the animation property in CSS :

• animation-delay
• animation-direction
• animation-duration
• animation-iteration-count
• animation-name
• animation-play-state
• animation-timing-function
• animation-fill-mode

Sample CSS animation sequence for move text across the screen

In the HTML part we will have a div with class container and a h3 with the text Hello World:

<div class="container">
    <h3> Hello World ! </h3>
</div>

For the CSS part :

.container {
    /* We will define the width, height and padding of the container */
    /* The text-align to center */
    width: 400px;
    height: 60px;
    padding: 32px;
    text-align: center;

    /* Use the animation `blink` to repeat infinitely for a time period of 2.5s*/
    animation-duration: 2.5s;           
    animation-iteration-count: infinite;
    animation-direction: normal;        
    animation-name: blink;              
    
    /* The same can be written shorthand as     */
    /* --------------------------------------   */
    /* animation: 2.5s infinite normal blink;   */
}
@keyframes blink {
    0%, 100% {              /* Defines the properties at these frames */
        background: #333;
        color: white;
    }

    50% {                   /* Defines the properties at these frames */
        background: #ccc;
        color: black;
        border-radius: 48px;
    }
}

More Information:

For more deatils on CSS Animations, please visit Mozilla Developer Network Docs