How to add dynamic color changing effect to background image in CSS3

In the previous article "Using CSS3 to create a cool triangular background image", we introduced you to a method of creating a cool triangular background image. Interested friends can learn about it. ~

The following article will introduce you to a method of creating a cool background image, and let you know how to use CSS3 to create a color-changing background image animation to make your web page more attractive!

Let’s take a look at the renderings first

Let’s study how to achieve this effect:

First of all We do not create a tag, but directly set the background image on the body tag

body { background-image: url("https://img.php.cn/upload/article/000/000/024/612360451cede816.jpg"); background-size: cover; background-repeat: no-repeat; background-attachment: fixed; background-position: center; }

How to change the color of the image? This requires adding a color layer as an overlay on the background image. This can be achieved using the linear-gradient() function:

background-image: linear-gradient(4deg, rgba(0,255,254,0.3) 50%, rgba(0,255,254,0.3) 100%), url("https://img.php.cn/upload/article/000/000/024/612360451cede816.jpg");

This is still static at this time Effect, how to achieve the dynamic effect of constantly changing colors? We can use @keyframes and animation attributes to achieve - add animation effects:

• Use animation attributes to set animation name, playback time, playback times, etc.:
  

body { background-image: url("https://img.php.cn/upload/article/000/000/024/612360451cede816.jpg"); background-size: cover; background-repeat: no-repeat; background-attachment: fixed; background-position: center; animation-name: background-overlay-animation; animation-duration: 5s; animation-iteration-count: infinite; animation-direction: alternate; animation-timing-function: linear; }

animation-name: Specify the name of the keyframe to be bound to the selector

animation-duration: The animation specifies how many seconds or milliseconds it takes to complete

animation-timing-function: Set how the animation will complete a cycle

animation-delay: Set the delay interval before the animation starts.

animation-iteration-count: Define the number of times the animation is played.

animation-direction: Specifies whether the animation should be played in reverse in turn.

animation-fill-mode: Specifies the style to be applied to the element when the animation does not play (when the animation is completed, or when the animation has a delay before starting to play).

animation-play-state: Specifies whether the animation is running or paused.

• Use @keyframes to define each frame of animation:

@keyframes background-overlay-animation { 0% { background-image: linear-gradient(4deg, rgba(255,78,36,0.3) 50%, rgba(255,78,36,0.3) 100%), url("https://img.php.cn/upload/article/000/000/024/612360451cede816.jpg"); } 25% { background-image: linear-gradient(4deg, rgba(213,49,127,0.3) 50%, rgba(213,49,127,0.3) 100%), url("https://img.php.cn/upload/article/000/000/024/612360451cede816.jpg"); } 50% { background-image: linear-gradient(4deg, rgba(36,182,255,0.3) 50%, rgba(36,182,255,1) 100%), url("https://img.php.cn/upload/article/000/000/024/612360451cede816.jpg"); } 100% { background-image: linear-gradient(4deg, rgba(0,255,254,0.3) 50%, rgba(0,255,254,0.3) 100%), url("https://img.php.cn/upload/article/000/000/024/612360451cede816.jpg"); } }

The complete code is given below:

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