* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

section ul.sectionul {
  display: flex;
  margin-bottom: 10px;
  justify-content: center;
}
section ul.sectionul li {
  list-style: none;
  background: #eee;
  padding: 8px 20px;
  margin: 5px;
  letter-spacing: 1px;
  cursor: pointer;
}
section ul.sectionul li.actived {
  background: #3fa8a7;
  color: #fff;
}
.product {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}
.product .itembox {
  position: relative;
  width: 300px;
  height: 300px;
  margin: 5px;
}
.product .itembox img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}