.bird {
    background-image: url(layers/birds_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-container {
    position: absolute;
    top: 40%;
    left: -7.5vw;
    -webkit-transform: scale(0);
    transform: scale(0);
    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;
}
 @-webkit-keyframes fly-cycle {
 100% {
 background-position: -900px 0;
}
}
 @keyframes fly-cycle {
 100% {
 background-position: -900px 0;
}
}
@-webkit-keyframes fly-right-one {
 0% {
 left: -10%;
 -webkit-transform: scale(0.3);
 transform: scale(0.3);
}
 10% {
 left: 10%;
 -webkit-transform: translateY(2vh) scale(0.4);
 transform: translateY(2vh) scale(0.4);
}
 20% {
 left: 30%;
 -webkit-transform: translateY(0vh) scale(0.5);
 transform: translateY(0vh) scale(0.5);
}
 30% {
 left: 50%;
 -webkit-transform: translateY(4vh) scale(0.6);
 transform: translateY(4vh) scale(0.6);
}
 40% {
 left: 70%;
 -webkit-transform: translateY(2vh) scale(0.6);
 transform: translateY(2vh) scale(0.6);
}
 50% {
 left: 90%;
 -webkit-transform: translateY(0vh) scale(0.6);
 transform: translateY(0vh) scale(0.6);
}
 60% {
 left: 110%;
 -webkit-transform: translateY(0vh) scale(0.6);
 transform: translateY(0vh) scale(0.6);
}
 100% {
 left: 110%;
 opacity: 1;
 -webkit-transform: translateY(0vh) scale(0.6);
 transform: translateY(0vh) scale(0.6);
}
}
@keyframes fly-right-one {
 0% {
 left: -10%;
 -webkit-transform: scale(0.3);
 transform: scale(0.3);
}
 10% {
 left: 10%;
 -webkit-transform: translateY(2vh) scale(0.4);
 transform: translateY(2vh) scale(0.4);
}
 20% {
 left: 30%;
 -webkit-transform: translateY(0vh) scale(0.5);
 transform: translateY(0vh) scale(0.5);
}
 30% {
 left: 50%;
 -webkit-transform: translateY(4vh) scale(0.6);
 transform: translateY(4vh) scale(0.6);
}
 40% {
 left: 70%;
 -webkit-transform: translateY(2vh) scale(0.6);
 transform: translateY(2vh) scale(0.6);
}
 50% {
 left: 90%;
 -webkit-transform: translateY(0vh) scale(0.6);
 transform: translateY(0vh) scale(0.6);
}
 60% {
 left: 110%;
 -webkit-transform: translateY(0vh) scale(0.6);
 transform: translateY(0vh) scale(0.6);
}
 100% {
 left: 110%;
 opacity: 1;
 -webkit-transform: translateY(0vh) scale(0.6);
 transform: translateY(0vh) scale(0.6);
}
}