style.css

#sliders {
  height: 400px;
  width: 60%;
  overflow: hidden;
  margin: 0 auto;
  position: relative;
}

.gallery-header {
  display: none;
}

.slider-item {
  display: none;
}

.img-thumbnail {
  cursor: pointer;
}

.added {
  border: 2px solid #1e1743;
  border-radius: 5px;
}

img {
  height: 400px;
  object-fit: cover;
}

.prev-next {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
  cursor: pointer;
}

.prev,
.next {
  background-color: transparent;
  padding: 8px 10px;
  color: #fff;
}

.dot {
  background-color: rgb(163, 156, 156);
  height: 10px;
  width: 10px;
  border-radius: 50%;
  cursor: pointer;
  margin: 0 3px;
}

.main {
  display: none;
}

.body {
  padding: 5%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji",
    "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  display: flex;
  text-align: left;
  background-color: #fff;
  align-content: center;
  justify-content: center;
  flex-direction: row;
  flex-wrap: wrap;
}

.container {
  width: 80%;
  height: 92%;
  position: absolute;
  background-color: rgba(255,255,255,0.8);
  box-shadow: 10px 0 20px #777;
  overflow: auto;
  padding: inherit;
}

@media (max-width: 767px) {
  .justify-content-around.align-items-center.mt-3.gallery-header.mb-2 {
    flex-direction: column;
  }
  #sliders {
    height: 300px;
    width: 90%;
  }
}