.my-gallery {
  width: 100%;
  text-align: center;
  margin-left: 1.5vw;
  margin-top: 90px;
}

.my-gallery img {
  width: 32vw; 
  height: auto;
}

.my-gallery figure {
  display: block;
  float: left;
  margin: -.5vw .5vw .5vw 0;
}

.my-gallery figcaption {
  display: none;
}

@media screen and (max-width: 860px) {
  .my-gallery img {
    width: 48vw;
    padding-left: .25vw;
    padding-right: .25vw;
  }
  .my-gallery {
    margin-left: 1.25vw;
    display: block;
  }
}