border

HTML

<img src="" alt="380x380px" class="slider__img">

CSS

.slider__img {
	width: 430px;
	height: 430px;
	background-color: #333;
	border: 25px solid #6b6b6b;
	border-radius: 50%;
	margin-left: 50px;
	flex-shrink: 0;
  text-align: center;
  color: #fff;
  font-size: 28px;
}