body {
  border: 0;
  margin: 0;
}

.control_buttons {
  width: 50px;
}

#bottomScreen {
  width: 316px;
  height: 208px;
  overflow: hidden;
  visibility: visible;
}

#helpscreen {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px;
  overflow: hidden;
  visibility: hidden;
  background-color: white;
}

#verticals {
  top: 10px;
  left: 0px;
  position: absolute;
}

#horizontals {
  top: 0px;
  left: 10px;
  position: absolute;
}

#verticalsback {
  top: 10px;
  left: 0px;
  position: absolute;
}

#horizontalsback {
  top: 0px;
  left: 10px;
  position: absolute;
}

#markp1 {
  top: 10px;
  left: 10px;
  position: absolute;
}

#markp2 {
  top: 10px;
  left: 10px;
  position: absolute;
}

#player1 {
  top: 10px;
  left: 220px;
  position: absolute;
}

#player2 {
  top: 48px;
  left: 220px;
  position: absolute;
}

#navigation_button {
  top: 90px;
  left: 220px;
  position: absolute;
}

#corner {
  position: absolute;
  left: 300px;
  top: 1px;
}

img {
  width: 20px;
  height: 20px;
}

@media (min-width: 400px) {
  body {
    outline: 1px solid black;
    box-sizing: border-box;
    height: 208px;
    margin: auto;
  }
}

button {
  margin-bottom: 15px;
}