Pulse Circle Loader

HTML

<div class="pulse-circle"></div>

CSS

.pulse-circle {
    width: 32px;
    height: 32px;
    background: #48f;
    opacity: .5;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;
    -webkit-animation: pulse 2s infinite; /* Safari 4+ */
       -moz-animation: pulse 2s infinite; /* Fx 5+ */
         -o-animation: pulse 2s infinite; /* Opera 12+ */
            animation: pulse 2s infinite; /* IE 10+, Fx 29+ */
}
@-webkit-keyframes pulse {
    0% {
        -webkit-transform: scale(0.3);
           -moz-transform: scale(0.3);
            -ms-transform: scale(0.3);
             -o-transform: scale(0.3);
                transform: scale(0.3);
    }
    50% {
        -webkit-transform: scale(1);
           -moz-transform: scale(1);
            -ms-transform: scale(1);
             -o-transform: scale(1);
                transform: scale(1);
    }
    100% {
        -webkit-transform: scale(0.3);
           -moz-transform: scale(0.3);
            -ms-transform: scale(0.3);
             -o-transform: scale(0.3);
                transform: scale(0.3);
    }
}
@-moz-keyframes pulse {
    0% {
        -webkit-transform: scale(0.3);
           -moz-transform: scale(0.3);
            -ms-transform: scale(0.3);
             -o-transform: scale(0.3);
                transform: scale(0.3);
    }
    50% {
        -webkit-transform: scale(1);
           -moz-transform: scale(1);
            -ms-transform: scale(1);
             -o-transform: scale(1);
                transform: scale(1);
    }
    100% {
        -webkit-transform: scale(0.3);
           -moz-transform: scale(0.3);
            -ms-transform: scale(0.3);
             -o-transform: scale(0.3);
                transform: scale(0.3);
    }
}
@-o-keyframes pulse {
    0% {
        -webkit-transform: scale(0.3);
           -moz-transform: scale(0.3);
            -ms-transform: scale(0.3);
             -o-transform: scale(0.3);
                transform: scale(0.3);
    }
    50% {
        -webkit-transform: scale(1);
       ...