.lazy {
  opacity: 0;
  -webkit-transition: opacity 0.5s;
  transition: opacity 0.5s;
}
.lazy.loaded {
  opacity: 1;
}

.wei-picture-wrapper {
  position: relative;
}
.wei-picture-wrapper img {
  min-width: 100%;
  height: auto;
}
.wei-picture-wrapper .content {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}
.wei-picture-wrapper .content .content-align {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}