* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    width: 100%;
    height: 100vh;
    background: #000;
    overflow: hidden;
}

.cursor {
    position: relative;
    width: 100px;
    height: 100px;
}

.cursor .circle {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 100%;
    height: 100%;
    background: linear-gradient(#00d0ff, #ff005e);
    border-radius: 50%;
    animation: animate 2s linear infinite ease-in;
}

@keyframes animate {
    0% {
        filter: hue-rotate(0deg);
    }

    100% {
        filter: hue-rotate(360deg);
    }
}