.class i {
    width: 90px;
    height: 90px;
    background: #223859;
    display: block;
    color: #fff;
    border: 3px solid #fff;
    border-radius: 50%;
    position: absolute;
    left: 50%;
    margin-left: -45px;
    bottom: -30px;
    transition: .2s;
}