<div class="flex-gallery">
  <div class="panel active" style="background-image: url('https://placehold.co/600x800/3b82f6/ffffff?text=Explore')">
    <h3>Explore</h3>
  </div>
  <div class="panel" style="background-image: url('https://placehold.co/600x800/ec4899/ffffff?text=Create')">
    <h3>Create</h3>
  </div>
  <div class="panel" style="background-image: url('https://placehold.co/600x800/10b981/ffffff?text=Design')">
    <h3>Design</h3>
  </div>
  <div class="panel" style="background-image: url('https://placehold.co/600x800/f59e0b/ffffff?text=Build')">
    <h3>Build</h3>
  </div>
</div>

.flex-gallery {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  display: flex;
  width: 100%;
  height: 400px;
  gap: 10px;
}
.panel {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  height: 100%;
  border-radius: 20px;
  color: #fff;
  cursor: pointer;
  flex: 1;
  transition: flex 0.5s cubic-bezier(0.05, 0.6, 0.4, 0.9);
  position: relative;
  overflow: hidden;
}
.panel h3 {
  position: absolute;
  bottom: 20px;
  left: 20px;
  margin: 0;
  font-size: 1.5rem;
  opacity: 0;
  transition: opacity 0.3s 0.2s;
  background: rgba(0,0,0,0.5);
  padding: 5px 15px;
  border-radius: 8px;
}
.panel:hover {
  flex: 5;
}
.panel:hover h3 {
  opacity: 1;
}