.container {
    z-index: 1;
    position: relative;
    overflow: hidden;
   /*   border:1px solid #888;   */
    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;
    min-height: 15em;

}
.container_2 {
    z-index: 1;
    position: relative;
    overflow: hidden;
    width: 100%;
    height: 145px;     
}

.bird {
    background-image: url(../images/birds.svg) ;
    background-size: auto 100%;
    width: 145px;
    height: 160px;
    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: 8%;
    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);
}
}