.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}
body {
  background-color: #eee;
  overflow: hidden;
}

.background {
  width: 600px;
  height: 600px;
  margin: 0 auto;
  top: 10vh;
  position: relative;
  background-image: url(../img/background.png);
  background-repeat: no-repeat;
  background-size: contain;
  overflow: hidden;
}

.score {
  position: relative;
  top: 10px;
  left: 10px;
  z-index: 100;
  user-select: none;
}

.chiken {
  width: 50px;
  height: 50px;
  position: absolute;
  background-image: url(../img/chiken.png);
  background-repeat: no-repeat;
  background-size: cover;
  bottom: 250px;
  left: 100px;
  box-sizing: border-box;
}

.down-wall,
.top-wall {
  display: inline-block;
  width: 100px;
  height: 355px;
  position: absolute;
  background-image: url(../img/downside.png);
  background-repeat: no-repeat;
  background-size: contain;
  left: 600px;
  top: 330px;
}
.top-wall.anim,
.down-wall.anim {
  animation: wallmove 3s infinite linear;
}

.top-wall {
  background-image: url(../img/upside.png);
  left: 600px;
  top: -200px;
}

.down-wall:nth-child(2) {
  left: 600px;
  top: 330px;
  /* animation: wallmove 3s infinite linear; */
  animation-delay: 1s;
}

.top-wall:nth-child(5) {
  left: 600px;
  top: -200px;
  /* animation: wallmove 3s infinite linear; */
  animation-delay: 1s;
}

.down-wall:nth-child(3) {
  left: 600px;
  top: 330px;
  /* animation: wallmove 3s infinite linear; */
  animation-delay: 2s;
}
.top-wall:nth-child(6) {
  left: 600px;
  top: -200px;
  /* animation: wallmove 3s infinite linear; */
  animation-delay: 2s;
}

@keyframes wallmove {
  0% {
  }
  100% {
    left: -300px;
  }
}

.dimd {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 50;
  background: rgba(0, 0, 0, 0.2);
}
.dimd.on {
  display: block;
}

.start {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 50;
  font-size: 8em;
  text-align: center;
  user-select: none;
}

.start.on {
  display: none;
}

.text-game-over {
  text-align: center;
  font-size: 20px;
  margin: 150px 0 20px 0;
  user-select: none;
}

.score-board {
  width: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0 auto;
  padding: 30px;
  background-color: #f5c9a1;
  border: 1px solid #000;
  border-radius: 10px;
}

.text-score {
  margin-bottom: 30px;
  font-size: 30px;
  user-select: none;
}
.best-score {
  font-size: 30px;
  color: rosybrown;
  animation: best 1s infinite linear;
  user-select: none;
}

.btn-restart {
  width: 100px;
  padding: 10px;
  border-radius: 5px;
  font-size: 15px;
  background-color: blanchedalmond;
  cursor: pointer;
  user-select: none;
}

@keyframes best {
  0% {
    color: #3a88f0;
  }
  25% {
    color: #949af5;
  }
  50% {
    color: #d0f561;
  }
  75% {
    color: #f58ed7;
  }
  100% {
    color: #3a88f0;
  }
}

.wrap-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 20px;
}

.sns-shared {
  display: flex;
  gap: 5px;
}

.btn-share {
  width: 40px;
  height: 40px;
  cursor: pointer;
}

.btn-share.band {
  border-radius: 100px;
}

@media screen and (max-width: 420px) {
  .background {
    width: 100vw;
    height: 600px;
    top: 0;
    background-size: cover;
  }
}