CSS3 pulsar

by Варлам Ерофеич

HTML

<div class="pulsar">
    <div class="ring"></div>
    <div class="ring"></div>
    <div class="ring"></div>
    <div class="ring"></div>
</div>

CSS

@keyframes pulsar {
    0% {
        transform: scale(0);
        opacity: 1;
    }
    75% {
        opacity: 1;
    }
    100% {
        transform: scale(1);
        opacity: 0;
    }
}

@-webkit-keyframes pulsar {
    0% {
        -webkit-transform: scale(0);
        opacity: 1;
    }
    75% {
        opacity: 1;
    }
    100% {
        -webkit-transform: scale(1);
        opacity: 0;
    }
}

.pulsar {
    width: 400px;
    height: 400px;
    margin: 0px auto;
    position: relative;
}

.pulsar .ring {
    box-sizing: border-box;
    position: absolute;
    top: 50%;
    left: 50%;
    box-shadow: inset 0 0 10px 0 red;
    border-radius: 50%;
    width: 100%;
    height: 100%;
    margin-top: -50%;
    margin-left: -50%;
    -webkit-transform: scale(0);
    transform: scale(0);
}

.pulsar .ring:nth-child(1) {
    -webkit-animation: pulsar 2s 0s linear;
    animation: pulsar 2s 0s linear;
    border: 10px solid #f00;
}

.pulsar .ring:nth-child(2) {
    -webkit-animation: pulsar 2s 0.5s linear;
    animation: pulsar 2s 0.5s linear;
    border: 10px solid  #0f0;
}

.pulsar .ring:nth-child(3) {
    -webkit-animation: pulsar 2s 1s linear;
    animation: pulsar 2s 1s linear; 
    border: 10px solid  #00f;
}

.pulsar .ring:nth-child(4) {
    -webkit-animation: pulsar 2s 1.5s linear;
    animation: pulsar 2s 1.5s linear; border: 10px solid  #f0f;
}