.birds-container{
    height: 100%;
    width: 100%;
    position: absolute;
    top:0;
    bottom:0;
    right: 0;
    left: 0;
    overflow: hidden;
    z-index: 1;
}

.bird {
    background-image: url(/assets/images/backgrounds/birds.svg);
    background-size: auto 100%;
    width: 88px;
    height: 125px;
    will-change: background-position;
    animation-name: fly-cycle;
    animation-timing-function: steps(10);
    animation-iteration-count: infinite;
}
.bird--one {
    animation-duration: 1s;
    animation-delay: -0.5s;
}
.bird--two {
    animation-duration: 0.9s;
    animation-delay: -0.75s;
}
.bird--three {
    animation-duration: 1.25s;
    animation-delay: -0.25s;
}
.bird--four {
    animation-duration: 1.1s;
    animation-delay: -0.5s;
}

.bird-container {
    position: absolute;
    top: 20%;
    left: -10%;
    transform: scale(0) translateX(-10vw);
    will-change: transform;
    animation-name: fly-right-one;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}
.bird-container--one {
    animation-duration: 15s;
    animation-delay: 0;
}
.bird-container--two {
    animation-duration: 16s;
    animation-delay: 1s;
}
.bird-container--three {
    animation-duration: 14.6s;
    animation-delay: 9.5s;
}
.bird-container--four {
    animation-duration: 16s;
    animation-delay: 10.25s;
}

@keyframes fly-cycle {
    100% {
        background-position: -900px 0;
    }
}
@keyframes fly-right-one {
    0% {
        transform: scale(0.3) translateX(-10vw);
    }
    10% {
        transform: translateY(2vh) translateX(10vw) scale(0.4);
    }
    20% {
        transform: translateY(0vh) translateX(30vw) scale(0.5);
    }
    30% {
        transform: translateY(4vh) translateX(50vw) scale(0.6);
    }
    40% {
        transform: translateY(2vh) translateX(70vw) scale(0.6);
    }
    50% {
        transform: translateY(0vh) translateX(90vw) scale(0.6);
    }
    60% {
        transform: translateY(0vh) translateX(110vw) scale(0.6);
    }
    100% {
        transform: translateY(0vh) translateX(110vw) scale(0.6);
    }
}
@keyframes fly-right-two {
    0% {
        transform: translateY(-2vh) translateX(-10vw) scale(0.5);
    }
    10% {
        transform: translateY(0vh) translateX(10vw) scale(0.4);
    }
    20% {
        transform: translateY(-4vh) translateX(30vw) scale(0.6);
    }
    30% {
        transform: translateY(1vh) translateX(50vw) scale(0.45);
    }
    40% {
        transform: translateY(-2.5vh) translateX(70vw) scale(0.5);
    }
    50% {
        transform: translateY(0vh) translateX(90vw) scale(0.45);
    }
    51% {
        transform: translateY(0vh) translateX(110vw) scale(0.45);
    }
    100% {
        transform: translateY(0vh) translateX(110vw) scale(0.45);
    }
}