.wrapper{ 
width:99%;
margin:0 auto;
}
.wall-column {
  display: block;
  width: 50%;
  float: left;
  box-sizing: border-box;
}

.article {
  display: block;
  margin-bottom:15px;
  padding: 1%;
  background: white;
  border-radius: 3px;
}
.article img{border-radius:5px}