a.obl{
    position: relative;
    display:block;
    color: #ED5B00;
    text-decoration: none;
    margin: 20px auto;
    text-align:center;
    width:125px;
    font-family: verdana;
    font-size: 22px;
    letter-spacing: 2px;
    border-bottom: 2px solid transparent;
}

a.obl:hover,a.obl:focus{
    outline: none;
    border-bottom: 2px solid #eee;
}

a.obl::before, a.obl:after{
    position: absolute;
    top: 50%;
    left: 50%;
    width: 70px;
    height: 70px;
    border: 12px double rgba(0,0,0,0.1);
    border-radius: 50%;
    content: '';
    opacity: 0;
    -webkit-transform: translateX(-50%) translateY(-50%) scale(0.2);
    -moz-transform: translateX(-50%) translateY(-50%) scale(0.2);
    transform: translateX(-50%) translateY(-50%) scale(0.2);
}

a.obl:after{
    width: 60px;
    height: 60px;
    border-width: 6px;
    -webkit-transform: translateX(-50%) translateY(-50%) scale(0.8);
    -moz-transform: translateX(-50%) translateY(-50%) scale(0.8);
    transform: translateX(-50%) translateY(-50%) scale(0.8);
}

a.obl:hover:before, a.obl:hover:after{
    -webkit-animation: pulsate 1.2s infinite;
    -moz-animation: pulsate 1.2s infinite;
    -ms-animation: pulsate 1.2s infinite;
    animation: pulsate 1.2s infinite;
}

@-webkit-keyframes pulsate{

30%{
    opacity: 1;
    -webkit-transform: translateX(-50%) translateY(-50%) scale(1);
}

    100%{
    opacity: 0.3;
    -webkit-transform: translateX(-50%) translateY(-50%) scale(0.5);
    }

}

@-moz-keyframes pulsate{

30%{
    opacity: 1;
    -moz-transform: translateX(-50%) translateY(-50%) scale(1);
}

    100%{
    opacity: 0.3;
    -moz-transform: translateX(-50%) translateY(-50%) scale(0.5);
    }

}

@-ms-keyframes pulsate{

30%{
    opacity: 1;
    -ms-transform: translateX(-50%) translateY(-50%) scale(1);
}

    100%{
    opacity: 0.3;
    -ms-transform: translateX(-50%) translateY(-50%) scale(0.5);
    }

}

@-keyframes pulsate{

30%{
    opacity: 1;
    transform: translateX(-50%) translateY(-50%) scale(1);
}

    100%{
    opacity: 0.3;
    transform: translateX(-50%) translateY(-50%) scale(0.5);
    }
}