box-shadow doesnt work in android

Hi i've a div with this class. It must show 3 circles. In chrome works. But if i compile with ionic run android and i launch the app i see only one circle. How can i fix it?

thanks

.circles{
    opacity:0.6;
    background: darkviolet;
    border-radius: 50%;
    height:10px;
    width:10px;
    position: relative;
    -webkit-box-shadow: 0 0 0 3vmax purple,0 0 0 6vmax crimson, 0 0 0 9vmax red;
    box-shadow: 0 0 0 3vmax purple,0 0 0 6vmax crimson, 0 0 0 9vmax red;
}