.flex-wrapper {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-content: center;
  margin-top: 25px;
margin-left: 100px;
margin-right: 100px;
text-align: center;
background:#fff;
border:2px solid #a500ff;
border-radius:5px;
max-height: 1000px;
}
 .inner{display: flex;
  flex-wrap: nowrap;
  justify-content: center;

  align-content: center;
background-color:#a500ff;
background-image:repeating-linear-gradient(0deg, transparent, transparent 2px, #fff 2px, #fff 4px );
width: 1600px;
max-height: 700px;
overflow: scroll;
}