.useful-container {
  margin: 0 auto;
  overflow: hidden;
  padding: 2rem 3rem;
  align-items: center;
}
.useful-list {
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  width: 100%;
}

.useful-list .bg-img {
  width: 270px;
  height: 250px;
  position: relative;
}

.bg-img img {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  border-radius: 9px;
  height: 250px;
  width: 270px;
}

.bg-img .top-text {
  position: absolute;
  top: 20px;
  left: 20px;
  font-size: 24px;
  text-shadow: 0px 3px 3px rgba(0, 0, 0, 0.36);
  color: #fff;
}

.bg-img .bottom-text {
  position: absolute;
  left: 0;
  bottom: -1rem;
  font-size: 20px;
  text-shadow: 0px 1px 1px rgba(0, 0, 0, 0.16);
  color: #fff;
  padding: 1rem;
  background-color: rgba(66, 66, 66, 0.7);
  border-radius: 0 0 9px 9px;
  width: 100%;
}

ul {
  list-style-type: none;
  padding-left: 0;
}

ul li {
  list-style-type: none;
  display: list-item;
  text-align: -webkit-match-parent;
  unicode-bidi: isolate;
  margin: 0 auto;
  margin-bottom: 1rem;
}