#sequence_base{
  position: relative;
  background-color: grey;
  height: 400px;
  width: 353px;
}

.sequence_options{
  position: relative;
  z-index: 12;
  text-align: center;
  border: 1px solid #d3d3d3;
  background-color: green;
  color: #fff;
  cursor: move;
  width: 350px;
  height: 30px;
}

@media(max-width: 600px){
  #sequence_base{
      position: relative;
      background-color: grey;
      height: 200px;
      width: 353px;
  }