.wave {
    position: absolute;
    top: -99px;
    left: 0;
    width: 100%;
    height: 100px;
    background: url("../images/vector/wave-haikei-dark.png");
    background-size: 800px 100px;
}
.wave#wave1 {
    z-index: 20;
    opacity: 1;
    bottom: 0;
    animation: animateWaves 6s linear infinite;
}
.wave#wave2 {
    z-index: 19;
    opacity: 0.5;
    bottom: 10px;
    animation: animate 6s linear infinite !important;
}
.wave#wave3 {
    z-index: 20;
    opacity: 0.2;
    bottom: 15px;
    animation: animateWaves 4s linear infinite;
}
.wave#wave4 {
    z-index: 19;
    opacity: 0.7;
    bottom: 20px;
    animation: animate 4s linear infinite;
}
@keyframes animateWaves {
    0% {
        background-position-x: 800px;
    }
    100% {
        background-position-x: 0px;
    }
}
@keyframes animate {
    0% {
        background-position-x: -800px;
    }
    100% {
        background-position-x: 0px;
    }
}