.container {
    z-index: 3;
    position: absolute;
    top: 15px;
    left: 14%;
    /* right: 50%; */
    overflow: hidden;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    width: 100%;
    min-height: 139px;
    /* padding: 2rem; */
}
.bird {
    background-image: url("http://www.iamramraj.com/demo/Flying_birds_CSS_animation_examples/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: 20%;
    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);
    }
}
@-webkit-keyframes fly-right-two {
    0% {
        left: -10%;
        opacity: 1;
        -webkit-transform: translateY(-2vh) scale(0.5);
        transform: translateY(-2vh) scale(0.5);
    }
    10% {
        left: 10%;
        -webkit-transform: translateY(0vh) scale(0.4);
        transform: translateY(0vh) scale(0.4);
    }
    20% {
        left: 30%;
        -webkit-transform: translateY(-4vh) scale(0.6);
        transform: translateY(-4vh) scale(0.6);
    }
    30% {
        left: 50%;
        -webkit-transform: translateY(1vh) scale(0.45);
        transform: translateY(1vh) scale(0.45);
    }
    40% {
        left: 70%;
        -webkit-transform: translateY(-2.5vh) scale(0.5);
        transform: translateY(-2.5vh) scale(0.5);
    }
    50% {
        left: 90%;
        -webkit-transform: translateY(0vh) scale(0.45);
        transform: translateY(0vh) scale(0.45);
    }
    51% {
        left: 110%;
        -webkit-transform: translateY(0vh) scale(0.45);
        transform: translateY(0vh) scale(0.45);
    }
    100% {
        left: 110%;
        -webkit-transform: translateY(0vh) scale(0.45);
        transform: translateY(0vh) scale(0.45);
    }
}
@keyframes fly-right-two {
    0% {
        left: -10%;
        opacity: 1;
        -webkit-transform: translateY(-2vh) scale(0.5);
        transform: translateY(-2vh) scale(0.5);
    }
    10% {
        left: 10%;
        -webkit-transform: translateY(0vh) scale(0.4);
        transform: translateY(0vh) scale(0.4);
    }
    20% {
        left: 30%;
        -webkit-transform: translateY(-4vh) scale(0.6);
        transform: translateY(-4vh) scale(0.6);
    }
    30% {
        left: 50%;
        -webkit-transform: translateY(1vh) scale(0.45);
        transform: translateY(1vh) scale(0.45);
    }
    40% {
        left: 70%;
        -webkit-transform: translateY(-2.5vh) scale(0.5);
        transform: translateY(-2.5vh) scale(0.5);
    }
    50% {
        left: 90%;
        -webkit-transform: translateY(0vh) scale(0.45);
        transform: translateY(0vh) scale(0.45);
    }
    51% {
        left: 110%;
        -webkit-transform: translateY(0vh) scale(0.45);
        transform: translateY(0vh) scale(0.45);
    }
    100% {
        left: 110%;
        -webkit-transform: translateY(0vh) scale(0.45);
        transform: translateY(0vh) scale(0.45);
    }
}
.bird {
    background-image: url("http://www.iamramraj.com/demo/Flying_birds_CSS_animation_examples/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: 20%;
    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);
    }
}
@-webkit-keyframes fly-right-two {
    0% {
        left: -10%;
        opacity: 1;
        -webkit-transform: translateY(-2vh) scale(0.5);
        transform: translateY(-2vh) scale(0.5);
    }
    10% {
        left: 10%;
        -webkit-transform: translateY(0vh) scale(0.4);
        transform: translateY(0vh) scale(0.4);
    }
    20% {
        left: 30%;
        -webkit-transform: translateY(-4vh) scale(0.6);
        transform: translateY(-4vh) scale(0.6);
    }
    30% {
        left: 50%;
        -webkit-transform: translateY(1vh) scale(0.45);
        transform: translateY(1vh) scale(0.45);
    }
    40% {
        left: 70%;
        -webkit-transform: translateY(-2.5vh) scale(0.5);
        transform: translateY(-2.5vh) scale(0.5);
    }
    50% {
        left: 90%;
        -webkit-transform: translateY(0vh) scale(0.45);
        transform: translateY(0vh) scale(0.45);
    }
    51% {
        left: 110%;
        -webkit-transform: translateY(0vh) scale(0.45);
        transform: translateY(0vh) scale(0.45);
    }
    100% {
        left: 110%;
        -webkit-transform: translateY(0vh) scale(0.45);
        transform: translateY(0vh) scale(0.45);
    }
}
@keyframes fly-right-two {
    0% {
        left: -10%;
        opacity: 1;
        -webkit-transform: translateY(-2vh) scale(0.5);
        transform: translateY(-2vh) scale(0.5);
    }
    10% {
        left: 10%;
        -webkit-transform: translateY(0vh) scale(0.4);
        transform: translateY(0vh) scale(0.4);
    }
    20% {
        left: 30%;
        -webkit-transform: translateY(-4vh) scale(0.6);
        transform: translateY(-4vh) scale(0.6);
    }
    30% {
        left: 50%;
        -webkit-transform: translateY(1vh) scale(0.45);
        transform: translateY(1vh) scale(0.45);
    }
    40% {
        left: 70%;
        -webkit-transform: translateY(-2.5vh) scale(0.5);
        transform: translateY(-2.5vh) scale(0.5);
    }
    50% {
        left: 90%;
        -webkit-transform: translateY(0vh) scale(0.45);
        transform: translateY(0vh) scale(0.45);
    }
    51% {
        left: 110%;
        -webkit-transform: translateY(0vh) scale(0.45);
        transform: translateY(0vh) scale(0.45);
    }
    100% {
        left: 110%;
        -webkit-transform: translateY(0vh) scale(0.45);
        transform: translateY(0vh) scale(0.45);
    }
}