https://developer.mozilla.org/en-US/docs/Web/API/Houdini_APIs
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>Houdini</title>
<link rel="stylesheet" href="./index.css">
</head>
<body>
<div class="card container">
<div class="cover">Houdini</div>
</div>
</body>
</html>
css:
body {
background-color: black;
display: flex;
align-items: center;
justify-content: center;
}
.container {
position: relative;
margin: 50px;
width: 300px;
height: 600px;
border-radius: 20px;
display: flex;
align-items: center;
justify-content: center;
}
.cover {
width: 92%;
height: 96%;
background-color: black;
border-radius: 20px;
color: red;
font-size: 2rem;
display: grid;
justify-content: center;
align-items: center;
text-align: center;
}
@property --direc {
syntax: '<angle>';
inherits: false;
initial-value: 0deg;
}
.card {
/* due to --direc is not a css property, animation cannot be applied to it */
--direc: 0deg;
background-image: linear-gradient(var(--direc), #5ddcff, #3c67e3, #4300c2);
animation: rotate 3s linear infinite;
}
@keyframes rotate {
to {
--direc: 360deg;
}
}
Key point is we define a css property:
@property --direc {
syntax: '<angle>';
inherits: false;
initial-value: 0deg;
}Due to it's a css property, and degis number value which can be animated.
