* {
  box-sizing: border-box;
}

body {
  padding: 0 5%;
}

#border-row {
  background-color: black;
}

.test {
  /* border: 1px solid black; */
  white-space: nowrap;
  overflow-x: scroll;
}

#output {
  width: 100%;
  border: 1px solid black;
  white-space: nowrap;
  overflow: scroll;
}