Try CSS

.img-triangle {
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
}

.img-circle {
  clip-path: circle(30%);
}

.img-rhombus {
  clip-path: polygon(25% 0%, 100% 0%, 75% 100%, 0% 100%);
}

.img-star {
  clip-path: polygon(45% 3%, 76% 99%, 2% 29%, 95% 29%, 15% 99%);
}

.img-arrow {
  clip-path: polygon(
    0% 20%,
    50% 20%,
    50% 0%,
    100% 50%,
    50% 100%,
    50% 80%,
    0% 80%
  );
}