.body {
  margin: 0;
  padding: 0;
}
#content {
  width: 320px;
  height: 568px;
  background: lightblue;
  margin: 0 auto;
  position: relative;
}
#content #start {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url(img/background-start.png) no-repeat;
}
#content #start button {
  width: 150px;
  height: 30px;
  border: 1px solid black;
  border-radius: 30px;
  background: #C4C9CA;
  margin: 0 auto;
  display: block;
  position: absolute;
  bottom: 50px;
  left: 0;
  right: 0;
}
#content #main {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url(img/background-game.png) no-repeat;
}
#content #main #score {
  position: absolute;
  top: 10px;
  left: 10px;
}
#content #main #suspend {
  display: none;
}
#content #main #suspend button {
  width: 150px;
  height: 30px;
  border: 1px solid black;
  border-radius: 30px;
  background: #C4C9CA;
  margin: 0 auto;
  display: block;
  position: absolute;
  bottom: 50px;
  left: 0;
  right: 0;
  top: 60%;
  z-index: 2;
}
#content #main #suspend button:first-child {
  margin-top: -40px;
}
#content #main img {
  position: absolute;
}
#content #settlement {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  text-align: center;
  padding-top: 60%;
  box-sizing: border-box;
}
#content button {
  width: 150px;
  height: 30px;
  border: 1px solid black;
  border-radius: 30px;
  background: #C4C9CA;
  margin: 0 auto;
  display: block;
  position: absolute;
  bottom: 50px;
  left: 0;
  right: 0;
}