@charset "UTF-8";

body{ width: 100%;
    background-image:url("image/last.png") ;
    background-size: cover;
    font-family: sans-serif;


}
.mainContent{
    width: 100%;
    margin-top: 200px;
    line-height: 200%;
    text-align: center;
    color: #fff;
}
.top{
    width: 100%;
    margin-top: 40px;
   
    text-align: center;
}
.tuite{
    width: 100%;
    margin-top: 10px;
   
    text-align: center;

}


.bird {
    position: absolute;
    width: 7px;
    height: 7px;
    transform: rotate(45deg);
    animation: moving 16s linear infinite;
  }
  
  .bird.-type_2 {
    animation-delay: 1s;
  }
  .bird.-type_2:before,
  .bird.-type_2:after {
    animation-delay: -2s;
  }
  
  .bird.-type_3 {
    animation-delay: 3s;
  }
  
  @keyframes moving {
    0% {
      top: 47vh;
      left: -2vw;
    }
    25% {
      top: 51vh;
      left: 23vw
    }
    100% {
      top: 47vh;
      left: 101vw;
    }
  }
  
.bird:before, .bird:after {
    content: "";
    position: absolute;
    bottom: 0;
    right: 0;
    background-color: black;
    transform: rotate(-30deg);
    transform-origin: right bottom;
  }
  
  .bird:before {
    width: 100%;
    height: 1px;
    animation: leftWing 8s linear infinite;
  }
  .bird:after {
    width: 1px;
    height: 100%;
    animation: rightWing 8s linear infinite;
  }
  
  @keyframes leftWing {
    0%   { transform: rotate(-30deg); }
    2%   { transform: rotate(-110deg); }
    4%   { transform: rotate(-30deg); }
    6%   { transform: rotate(-110deg); }
    8%   { transform: rotate(-30deg); }
    10%  { transform: rotate(-110deg); }
    12%  { transform: rotate(-30deg); }
    30%  { transform: rotate(-30deg); }
    42%  { transform: rotate(-35deg); }
    72%  { transform: rotate(-35deg); }
    74%  { transform: rotate(10deg); }
    76%  { transform: rotate(-30deg); }
    78%  { transform: rotate(-110deg); }
    80%  { transform: rotate(-30deg); }
    82%  { transform: rotate(-110deg); }
    84%  { transform: rotate(-30deg); }
    86%  { transform: rotate(-110deg); }
    88%  { transform: rotate(-30deg); }
    90%  { transform: rotate(-110deg); }
    92%  { transform: rotate(-30deg); }
    94%  { transform: rotate(-110deg); }
    96%  { transform: rotate(-30deg); }
    98%  { transform: rotate(-110deg); }
    100% { transform: rotate(-30deg); }
  }
  
  @keyframes rightWing {
    0%   { transform: rotate(30deg); }
    2%   { transform: rotate(110deg); }
    4%   { transform: rotate(30deg); }
    6%   { transform: rotate(110deg); }
    8%   { transform: rotate(30deg); }
    10%  { transform: rotate(110deg); }
    12%  { transform: rotate(30deg); }
    30%  { transform: rotate(30deg); }
    42%  { transform: rotate(35deg); }
    72%  { transform: rotate(35deg); }
    74%  { transform: rotate(0deg); }
    76%  { transform: rotate(30deg); }
    78%  { transform: rotate(110deg); }
    80%  { transform: rotate(30deg); }
    82%  { transform: rotate(110deg); }
    84%  { transform: rotate(30deg); }
    86%  { transform: rotate(110deg); }
    88%  { transform: rotate(30deg); }
    90%  { transform: rotate(110deg); }
    92%  { transform: rotate(30deg); }
    94%  { transform: rotate(110deg); }
    96%  { transform: rotate(30deg); }
    98%  { transform: rotate(110deg); }
    100% { transform: rotate(30deg); }
  }
  
  /****** Base style. ******/
  body {
    overflow: hidden;
    height: 100vh;
    margin: 0;
  }