.gradient-border {
    --borderWidth: 3px;
    position: relative;
    border-radius: var(--borderWidth);
}

.gradient-border:after {
    content: '';
    position: absolute;
    top: calc(-1 * var(--borderWidth));
    left: calc(-1 * var(--borderWidth));
    height: calc(100% + var(--borderWidth) * 2);
    width: calc(100% + var(--borderWidth) * 2);
    background: linear-gradient(60deg, #f79533, #f37055, #ef4e7b, #a166ab, #5073b8, #1098ad, #07b39b, #6fba82);
    border-radius: calc(2 * var(--borderWidth));
    z-index: -1;
    animation: animatedgradient 3s ease alternate infinite;
    background-size: 300% 300%;
}

@keyframes animatedgradient {
	0% {
		background-position: 0% 50%;
	}
	50% {
		background-position: 100% 50%;
	}
	100% {
		background-position: 0% 50%;
	}
}