body {
  background-color: #eeeeee;
  font-size: 20 px;
}

#drum-machine {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

#inner-container {
  outline: 3px solid red;
  text-align: center;
  background-color: #888888;
  padding: 10px;
  width: 400px;
  display: inline-block;
}

.drum-pad {
  width: 100px;
  height: 100px;
  border: 1px solid black;
  border-radius: 10px;
  cursor: pointer;
  display: inline-block;
  margin: 5px;
  text-align: center;
  background-color: #999999;
}

p {
  text-align: center;
  padding: 25px;
}

#display {
  width: 300px;
  background-color: #bbbbbb;
  margin: 7px auto;
  padding: 5px;
}