wave.css in Ajax loader 7

.ajax-throbber.sk-wave {
    width: 50px;
    text-align: center;
    font-size: 10px;
}

.ajax-throbber.sk-wave .sk-rect {
    background-color: #333;
    height: 100%;
    width: 6px;
    display: inline-block;
    -webkit-animation: sk-waveStretchDelay 1.2s infinite ease-in-out;
    animation: sk-waveStretchDelay 1.2s infinite ease-in-out;
}

.ajax-throbber.sk-wave .sk-rect1 {
    -webkit-animation-delay: -1.2s;
    animation-delay: -1.2s;
}

.ajax-throbber.sk-wave .sk-rect2 {
    -webkit-animation-delay: -1.1s;
    animation-delay: -1.1s;
}

.ajax-throbber.sk-wave .sk-rect3 {
    -webkit-animation-delay: -1s;
    animation-delay: -1s;
}

.ajax-throbber.sk-wave .sk-rect4 {
    -webkit-animation-delay: -0.9s;
    animation-delay: -0.9s;
}

.ajax-throbber.sk-wave .sk-rect5 {
    -webkit-animation-delay: -0.8s;
    animation-delay: -0.8s;
}

@-webkit-keyframes sk-waveStretchDelay {
    0%, 40%, 100% {
        -webkit-transform: scaleY(0.4);
        transform: scaleY(0.4);
    }
    20% {
        -webkit-transform: scaleY(1);
        transform: scaleY(1);
    }
}

@keyframes sk-waveStretchDelay {
    0%, 40%, 100% {
        -webkit-transform: scaleY(0.4);
        transform: scaleY(0.4);
    }
    20% {
        -webkit-transform: scaleY(1);
        transform: scaleY(1);
    }
}