wagtail/client/scss/components/_avatar.scss

// user avatars
.avatar {
  border-radius: 100%;
  position: relative;
  display: inline-block;
  vertical-align: middle;
  text-align: center;
  overflow: hidden;
  width: 50px;
  height: 50px;

  img {
    position: absolute;
    z-index: 2;
    top: 0;
    inset-inline-start: 0;
    inset-inline-end: 0;
    border: 0;
    object-fit: cover;
    width: 100%;
    height: 100%;
  }

  &.small {
    vertical-align: middle;
    margin: 0 0.5em;
    width: 25px;
    height: 25px;
  }

  &.large {
    width: 60px;
    height: 60px;

    @include media-breakpoint-up(sm) {
      width: 80px;
      height: 80px;
    }
  }

  &.square {
    border-radius: 0;
  }
}

.avatar--edit {
  overflow: visible;
  flex-shrink: 0;

  img {
    border-radius: 50%;
    z-index: auto;
  }
}

.avatar__edit-link {
  width: theme('spacing.5');
  height: theme('spacing.5');
  border-radius: 50%;
  border: theme('spacing.px') solid theme('colors.border-furniture');
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  top: 100%;
  inset-inline-start: 50%;
  transform: translate(calc(var(--w-direction-factor) * -50%), -50%);
  background-color: theme('colors.surface-page');

  .icon {
    width: theme('spacing.[2.5]');
    height: theme('spacing.[2.5]');
  }
}