How to Connect a CSS Animation's End to the Beginning So It Smoothly Continues

CSS3 animation - smooth infinite cycle

You just have to fix your frames in another way : make the from (0%) and to (100%) values the same:

html, body {       width: 100%; height: 100%;    margin: 0;    padding: 0;}body {    -webkit-animation: pulsate 20s linear infinite;    -moz-animation: pulsate 20s linear infinite;    animation: pulsate 20s linear infinite;}
@-webkit-keyframes pulsate {    0% {background: black}    20% {background: red}    40% {background: blue}    60% {background: orange}    80% {background: green}    100% {background: black}}@-moz-keyframes pulsate {    0% {background: black}    20% {background: red}    40% {background: blue}    60% {background: orange}    80% {background: green}    100% {background: black}}@keyframes pulsate {    0% {background: black}    20% {background: red}    40% {background: blue}    60% {background: orange}    80% {background: green}    100% {background: black}}

How to smoothly do CSS animation without break at the end

You can animate the position of the background, for example, move it to the left by the width of the image, so when the animation ends and starts again, you won’t actually see the difference. In this case, the width of your background image is 26px, therefore, you need to swipe the background to the left to the width of this background. In general, there are a lot of options, it all depends on what task you need to solve.

@keyframes moveSlideshow {
   100% {
     background-position-x: -26px;
   }
}

Also put the desired animation speed.

How to create a keyframe smooth continuous loop that doesn't jump with a background image?

Live example to continuously move up :

#animate-area {
  background-image: url('https://pt.freelogodesign.org/Content/img/logo-ex-2.png');
  width: 100%;
  height: 500px;

  background-position: 0;
 animation: slideup 5s linear 1s infinite;
 
 position:absolute;
}

@keyframes slideup {
  0% { background-position: 0 0; }
  50% { background-position: 0 -500px; }
  100% { background-position: 0 -900px; }
}

<div id="animate-area"></div>

CSS3: Smooth transition between animations change on :hover

I don't think that it can be achieved using the scale transforms.

You can do a trick and change from scale() to translateZ(). When a perspective is applied, the net effect will be also a scale. But the interesting point is than setting perspective to a high value, this scale effect can be made very small. And perspective is an animatable property.

The downside is that we will need to add 2 wrap around layers... but the final result is this. I have kept the original version to compare

@keyframes first-animation {0% { transform: scale(1,1);}50% { transform: scale(0.8,0.8); }100% { transform: scale(1,1); }}
@keyframes second-animation {0% { transform: scale(1,1); }70% { transform: scale(0.7,0.7); }80% { transform: scale(0.9,0.9); }100% { transform: scale(1,1);  }}
.sample {    background-color: lightblue;    animation: first-animation 1.7s ease-in-out infinite;}
.sample:hover {animation: second-animation 1.1s ease-in-out infinite;}
.dim {    width: 200px;    height: 200px;}
.base1 {    perspective: 1000px;    transition: perspective 2s ease-out;    position: absolute;    left: 300px;  top: 10px;}.base1:hover {    perspective: 9999px;}
.base2 {    width: 100%;    height: 100%;    animation: animation1 1.7s ease-in-out infinite;    perspective: 9999px;    transition: perspective 2s ease-in;}.base1:hover .base2 {    perspective: 1000px;}
.inner {    width: 100%;    height: 100%;    background-color: lightgreen;    animation: animation2 1.1s ease-in-out infinite;    transform-style: preserve-3d;    perspective: 99999px;}
@keyframes animation1 {0% { transform: translateZ(0px);}50% { transform: translateZ(-200px); }100% { transform: translateZ(0px); }}
@keyframes animation2 {      0% { transform: translateZ(0px);}     70% { transform: translateZ(-300px); }     80% { transform: translateZ(-100px); }    100% { transform: translateZ(0px); }}

<div class="sample dim">SAMPLE</div><div class="base1 dim">    <div class="base2">        <div class="inner">DEMO</div>    </div></div>

css3 animation change continuously

See here: http://jsfiddle.net/9CZFS/1/

animation:myfirst 5s linear infinite;
                        ----^-----

You need to specify that the animation is going to loop forever.

Also, if you want the animation to be smooth, you'll need to have it start and end with the same value:

0%,100%   {background:red;}
25%  {background:yellow;}
50%  {background:blue;}
75% {background:green;}

Smooth CSS3 animation

You could try:

@keyframes herobounce {
0%, 100% {height:100vh;}
50% {height:75vh;}
}

This would start your animation with 100vh and then transition to 75vh at 50% of your animation, then going back to 100vh.

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