#sky {
  background-color: #ffffff;
  padding-top: 5em;
}

/*Basic rectangle */
.rectangle {
  height: 8vh;
  width: 8vw;
  border: 10px solid #000000;
  background-color: #f7f7f7;
}

.buoy{
  z-index: 1;
  position: relative;
  animation: move-up-down 7s cubic-bezier(.55,.5,.45,.5)     infinite; 
}
/*Moves the buoy up and down independent of the waves */
@keyframes move-up-down {
  0% {
   transform: translate3d(0,-25%,0);
  }
  50% { 
    transform: translate3d(0,-50%,0);
  }
  100% {
    transform: translate3d(0,-25%,0);
   }
}

.waves {
    z-index: 2;
    width: 100%;
    height:15vh;
    min-height:100px;
    max-height:150px;
  }

  /* Animation */

  .parallax > use {
      animation: move-forever 25s cubic-bezier(.55,.5,.45,.5)     infinite;
    }
  .parallax > use:nth-child(1) {
    animation-delay: -2s;
    animation-duration: 7s;
  }
  .parallax > use:nth-child(2) {
    animation-delay: -3s;
    animation-duration: 10s;
  }
  .parallax > use:nth-child(3) {
    animation-delay: -4s;
    animation-duration: 13s;
  }
  .parallax > use:nth-child(4) {
    animation-delay: -5s;
    animation-duration: 20s;
  }
  @keyframes move-forever {
    0% {
     transform: translate3d(-90px,0,0);
    }
    100% { 
      transform: translate3d(85px,0,0);
    }
  }
  /*Shrinking for mobile*/
  @media (max-width: 768px) {
    .waves {
      height:40px;
      min-height:40px;
    }
    .content {
      height:30vh;
    }
    h1 {
      font-size:24px;
    }
  }