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

body {
  width: 100%;
  height: 100vh;
  display: flex;
  overflow: hidden;
  background: #121212;
  cursor: none;
}

.cursor {
  width: var(--size);
  height: var(--size);
  border-radius: 50%;
  position: absolute;
  left: 0;
  top: 0;
  pointer-events: none;
  z-index: 100;
}
.cursor--large {
  --size: 40px;
  border: 1px solid #ff3c3c;
}
.cursor--small {
  --size: 10px;
  background: #ff3c3c;
  transform: translate(-50%, -50%);
}