vtenext/themes/next/scss/loaders/_circle.scss

.dataloader {
	display: inline-block;
	width: 20px;
	height: 20px;

	&[data-loader="circle"] {
		-webkit-animation: circle infinite 0.75s linear;
		-moz-animation: circle infinite 0.75s linear;
		-o-animation: circle infinite 0.75s linear;
		animation: circle infinite 0.75s linear;

		border: 2px solid $circle-loader-bg;
		border-top-color: transparent;
		border-radius: 100%;
	}
	&.light {
		border: 2px solid $circle-loader-light-bg;
		border-top-color: $circle-loader-light-outer-bg;
	}
}

@-webkit-keyframes circle {
	0% {
		-webkit-transform: rotate(0);
		-ms-transform: rotate(0);
		-o-transform: rotate(0);
		transform: rotate(0);
	}
	100% {
		-webkit-transform: rotate(360deg);
		-ms-transform: rotate(360deg);
		-o-transform: rotate(360deg);
		transform: rotate(360deg);
	}
}

@-moz-keyframes circle {
	0% {
		-webkit-transform: rotate(0);
		-ms-transform: rotate(0);
		-o-transform: rotate(0);
		transform: rotate(0);
	}
	100% {
		-webkit-transform: rotate(360deg);
		-ms-transform: rotate(360deg);
		-o-transform: rotate(360deg);
		transform: rotate(360deg);
	}
}

@-o-keyframes circle {
	0% {
		-webkit-transform: rotate(0);
		-ms-transform: rotate(0);
		-o-transform: rotate(0);
		transform: rotate(0);
	}
	100% {
		-webkit-transform: rotate(360deg);
		-ms-transform: rotate(360deg);
		-o-transform: rotate(360deg);
		transform: rotate(360deg);
	}
}

@keyframes circle {
	0% {
		-webkit-transform: rotate(0);
		-ms-transform: rotate(0);
		-o-transform: rotate(0);
		transform: rotate(0);
	}
	100% {
		-webkit-transform: rotate(360deg);
		-ms-transform: rotate(360deg);
		-o-transform: rotate(360deg);
		transform: rotate(360deg);
	}
}