wxlitian/miniprogram/miniprogram_npm/tdesign-miniprogram/avatar/common.wxss

page {
  --td-avatar-group-border-color: #fff;
}
.border--small {
  border: 4rpx solid var(--td-avatar-group-border-color, #fff);
}
.border--medium {
  border: 6rpx solid var(--td-avatar-group-border-color, #fff);
}
.border--large {
  border: 8rpx solid var(--td-avatar-group-border-color, #fff);
}