/* birds here bcs hella long */
.bird {
    background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/174479/bird-cells.svg);
    background-size: auto 100%;
    width: 88px;
    height: 125px;
    will-change: background-position;
    -webkit-animation-name: fly-cycle;
    animation-name: fly-cycle;
    -webkit-animation-timing-function: steps(10);
    animation-timing-function: steps(10);
    -webkit-animation-iteration-count: infinite;
    animation-iteration-count: infinite;
  }
  
  .bird--one {
    -webkit-animation-duration: 1s;
    animation-duration: 1s;
    -webkit-animation-delay: -0.5s;
    animation-delay: -0.5s;
  }
  
  .bird--two {
    -webkit-animation-duration: 0.9s;
    animation-duration: 0.9s;
    -webkit-animation-delay: -0.75s;
    animation-delay: -0.75s;
  }
  
  .bird--three {
    -webkit-animation-duration: 1.25s;
    animation-duration: 1.25s;
    -webkit-animation-delay: -0.25s;
    animation-delay: -0.25s;
  }
  
  .bird--four {
    -webkit-animation-duration: 1.1s;
    animation-duration: 1.1s;
    -webkit-animation-delay: -0.5s;
    animation-delay: -0.5s;
  }
  
  .bird-container {
    position: absolute;
    top: 20%;
    left: -10%;
    -webkit-transform: scale(0) translateX(-10vw);
    transform: scale(0) translateX(-10vw);
    will-change: transform;
    -webkit-animation-name: fly-right-one;
    animation-name: fly-right-one;
    -webkit-animation-timing-function: linear;
    animation-timing-function: linear;
    -webkit-animation-iteration-count: infinite;
    animation-iteration-count: infinite;
  }
  
  .bird-container--one {
    -webkit-animation-duration: 15s;
    animation-duration: 15s;
    -webkit-animation-delay: 0;
    animation-delay: 0;
  }
  
  .bird-container--two {
    -webkit-animation-duration: 16s;
    animation-duration: 16s;
    -webkit-animation-delay: 1s;
    animation-delay: 1s;
  }
  
  .bird-container--three {
    -webkit-animation-duration: 14.6s;
    animation-duration: 14.6s;
    -webkit-animation-delay: 9.5s;
    animation-delay: 9.5s;
  }
  
  .bird-container--four {
    -webkit-animation-duration: 16s;
    animation-duration: 16s;
    -webkit-animation-delay: 10.25s;
    animation-delay: 10.25s;
  }
  
  @-webkit-keyframes fly-cycle {
    100% {
      background-position: -900px 0;
    }
  }
  
  @keyframes fly-cycle {
    100% {
      background-position: -900px 0;
    }
  }
  
  @-webkit-keyframes fly-right-one {
    0% {
      -webkit-transform: scale(0.3) translateX(-10vw);
      transform: scale(0.3) translateX(-10vw);
    }
    10% {
      -webkit-transform: translateY(2vh) translateX(10vw) scale(0.4);
      transform: translateY(2vh) translateX(10vw) scale(0.4);
    }
    20% {
      -webkit-transform: translateY(0vh) translateX(30vw) scale(0.5);
      transform: translateY(0vh) translateX(30vw) scale(0.5);
    }
    30% {
      -webkit-transform: translateY(4vh) translateX(50vw) scale(0.6);
      transform: translateY(4vh) translateX(50vw) scale(0.6);
    }
    40% {
      -webkit-transform: translateY(2vh) translateX(70vw) scale(0.6);
      transform: translateY(2vh) translateX(70vw) scale(0.6);
    }
    50% {
      -webkit-transform: translateY(0vh) translateX(90vw) scale(0.6);
      transform: translateY(0vh) translateX(90vw) scale(0.6);
    }
    60% {
      -webkit-transform: translateY(0vh) translateX(110vw) scale(0.6);
      transform: translateY(0vh) translateX(110vw) scale(0.6);
    }
    100% {
      -webkit-transform: translateY(0vh) translateX(110vw) scale(0.6);
      transform: translateY(0vh) translateX(110vw) scale(0.6);
    }
  }
  
  @keyframes fly-right-one {
    0% {
      -webkit-transform: scale(0.3) translateX(-10vw);
      transform: scale(0.3) translateX(-10vw);
    }
    10% {
      -webkit-transform: translateY(2vh) translateX(10vw) scale(0.4);
      transform: translateY(2vh) translateX(10vw) scale(0.4);
    }
    20% {
      -webkit-transform: translateY(0vh) translateX(30vw) scale(0.5);
      transform: translateY(0vh) translateX(30vw) scale(0.5);
    }
    30% {
      -webkit-transform: translateY(4vh) translateX(50vw) scale(0.6);
      transform: translateY(4vh) translateX(50vw) scale(0.6);
    }
    40% {
      -webkit-transform: translateY(2vh) translateX(70vw) scale(0.6);
      transform: translateY(2vh) translateX(70vw) scale(0.6);
    }
    50% {
      -webkit-transform: translateY(0vh) translateX(90vw) scale(0.6);
      transform: translateY(0vh) translateX(90vw) scale(0.6);
    }
    60% {
      -webkit-transform: translateY(0vh) translateX(110vw) scale(0.6);
      transform: translateY(0vh) translateX(110vw) scale(0.6);
    }
    100% {
      -webkit-transform: translateY(0vh) translateX(110vw) scale(0.6);
      transform: translateY(0vh) translateX(110vw) scale(0.6);
    }
  }
  
  @-webkit-keyframes fly-right-two {
    0% {
      -webkit-transform: translateY(-2vh) translateX(-10vw) scale(0.5);
      transform: translateY(-2vh) translateX(-10vw) scale(0.5);
    }
    10% {
      -webkit-transform: translateY(0vh) translateX(10vw) scale(0.4);
      transform: translateY(0vh) translateX(10vw) scale(0.4);
    }
    20% {
      -webkit-transform: translateY(-4vh) translateX(30vw) scale(0.6);
      transform: translateY(-4vh) translateX(30vw) scale(0.6);
    }
    30% {
      -webkit-transform: translateY(1vh) translateX(50vw) scale(0.45);
      transform: translateY(1vh) translateX(50vw) scale(0.45);
    }
    40% {
      -webkit-transform: translateY(-2.5vh) translateX(70vw) scale(0.5);
      transform: translateY(-2.5vh) translateX(70vw) scale(0.5);
    }
    50% {
      -webkit-transform: translateY(0vh) translateX(90vw) scale(0.45);
      transform: translateY(0vh) translateX(90vw) scale(0.45);
    }
    51% {
      -webkit-transform: translateY(0vh) translateX(110vw) scale(0.45);
      transform: translateY(0vh) translateX(110vw) scale(0.45);
    }
    100% {
      -webkit-transform: translateY(0vh) translateX(110vw) scale(0.45);
      transform: translateY(0vh) translateX(110vw) scale(0.45);
    }
  }
  
  @keyframes fly-right-two {
    0% {
      -webkit-transform: translateY(-2vh) translateX(-10vw) scale(0.5);
      transform: translateY(-2vh) translateX(-10vw) scale(0.5);
    }
    10% {
      -webkit-transform: translateY(0vh) translateX(10vw) scale(0.4);
      transform: translateY(0vh) translateX(10vw) scale(0.4);
    }
    20% {
      -webkit-transform: translateY(-4vh) translateX(30vw) scale(0.6);
      transform: translateY(-4vh) translateX(30vw) scale(0.6);
    }
    30% {
      -webkit-transform: translateY(1vh) translateX(50vw) scale(0.45);
      transform: translateY(1vh) translateX(50vw) scale(0.45);
    }
    40% {
      -webkit-transform: translateY(-2.5vh) translateX(70vw) scale(0.5);
      transform: translateY(-2.5vh) translateX(70vw) scale(0.5);
    }
    50% {
      -webkit-transform: translateY(0vh) translateX(90vw) scale(0.45);
      transform: translateY(0vh) translateX(90vw) scale(0.45);
    }
    51% {
      -webkit-transform: translateY(0vh) translateX(110vw) scale(0.45);
      transform: translateY(0vh) translateX(110vw) scale(0.45);
    }
    100% {
      -webkit-transform: translateY(0vh) translateX(110vw) scale(0.45);
      transform: translateY(0vh) translateX(110vw) scale(0.45);
    }
  }