how to round the corners of a div outline in css

/* Set rounded corners with border-radius property */

.class {
  border-radius: 4px;
}

.circle {
  border-radius: 50%;
}

div {
  outline: auto;
  outline-style: round;
}

/* Use border-radius property */

.class {
  border-radius: 5px;
}

.circle {
  border-radius: 50%;
}