Custom tabs

Hello, anyone knows how to do this middle button?
it is a ion-fab? or is made with css?

Capturar

Hello, do like this…

<div id="ionball"></div>
#ionball {
        position: absolute;
        bottom: 30px;
        left: calc(50% - 50px);
        width: 100px;
        height: 100px;
        background-image: url(../assets/images/ionball.png);
}