* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.game-board {
  width: 100%;
  height: 755px;
  border-bottom: 30px solid green;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
  background: linear-gradient(#87ceeb, #e0f6ff);
}

.pipe {
  position: absolute;
  bottom: -5px;
  width: 75px;
  animation: pipe-animation 1s infinite linear;
}

.mario {
  width: 150px;
  position: absolute;
  bottom: 0;
}

.jump {
  animation: jump 500ms ease-out;
}

.h1 {
  text-align: center;
  background-color: #87ceeb;
  font-family: verdana;
}

@keyframes pipe-animation {
  from {
    right: 0;
  }

  to {
    right: 100%;
  }
}

@keyframes jump {
  0% {
    bottom: 0;
  }

  40% {
    bottom: 180px;
  }

  50% {
    bottom: 180px;
  }

  60% {
    bottom: 180px;
  }

  100% {
    bottom: 0;
  }
}