body {
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
background: #222;
}
.animated-gradient-border-box {
--border-width: 3px;
position: relative;
display: flex;
justify-content: center;
align-items: center;
width: 250px;
height: 150px;
font-family: Arial, sans-serif;
font-size: 1.2rem;
color: white;
background: #222;
border-radius: var(--border-width);
}
.animated-gradient-border-box::after {
position: absolute;
content: "";
top: calc(-1 * var(--border-width));
left: calc(-1 * var(--border-width));
z-index: -1;
width: calc(100% + var(--border-width) * 2);
height: calc(100% + var(--border-width) * 2);
background: linear-gradient(
60deg,
hsl(224, 85%, 66%),
hsl(269, 85%, 66%),
hsl(314, 85%, 66%),
hsl(359, 85%, 66%),
hsl(44, 85%, 66%),
hsl(89, 85%, 66%),
hsl(134, 85%, 66%),
hsl(179, 85%, 66%)
);
background-size: 300% 300%;
background-position: 0 50%;
border-radius: calc(2 * var(--border-width));
animation: moveGradient 4s alternate infinite;
}
@keyframes moveGradient {
50% {
background-position: 100% 50%;
}
}
.content-inside {
padding: 20px;
text-align: center;
}
