.bird-parent {
    position: relative;
    overflow: hidden;
}

.bird {
    /* opacity: 0.2; */
    background-image: url(../img/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: 0vw;
    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;
}

/* .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% {
        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);
    }
}