img {
  max-width: 100%;
}
.page-content {

}
.page-content img {
  margin: auto;
  display: block;
  max-height: inherit;
}
.page-content  .trai ,.page-content  .left  {
  text-align: left;
}
.page-content  .phai,.page-content  .right {
  text-align: right;
}
.page-content ul, .page-content ol {
  padding-left: 15px;
}
.page-content ul li {
  list-style: disc;
}