how to get round div css code example

Example 1: round div

.circle {
  border-radius: 50%;
  height: 100px;
  width: 100px;
}

Example 2: css round element

/* I find it best to use pixels*/
    border-radius: 5px;

/* Percents don't work well with elements that aren't square*/
    border-radius: 10%;