.elementry-pulse_effect-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
}

.elementry-pulse_effect {
    display: inline-block;
    position: relative;  
}
.elementry-pulse_effect #main {
    height: 100px;
    width: 100px;
    background-color:#673ab7;
    border-radius: 50%;
}
.elementry-pulse_effect #main:hover {
    cursor: pointer;
}

.elementry-pulse_effect #wave, .elementry-pulse_effect #wave2 {
    height: 100px;
    width: 100px;
    background-color: silver;
    position: absolute;
    top:50%;
    left: 50%;
    transform: translate(-50%,-50%);
    border-radius: 50%;
    z-index: -1;
}
.elementry-pulse_effect #main:hover ~ #wave {
    -webkit-animation:pulseEffect 2s infinite linear;
}
.elementry-pulse_effect #main:hover ~ #wave2 {
    -webkit-animation:pulseEffect2 2s infinite linear;
}
@-webkit-keyframes pulseEffect{
    from{
        transform: translate(-50%,-50%) scale(0.5);
        opacity: 0.4;
    }
    to{
        transform: translate(-50%,-50%) scale(3);
        opacity: 0;
    }
}
@-webkit-keyframes pulseEffect2{
    from{
        transform: translate(-50%,-50%) scale(0);
        opacity: 0.6;
    }
    to{
        transform: translate(-50%,-50%) scale(2);
        opacity: 0;
    }
}